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Principal energy levels in atomic physics
electron shell may be thought of as an orbit that electrons follow around an atom's nucleus. The closest shell to the nucleus is called the "1 shell"
Electron_shell
Mode of arrangement of electrons in different shells of an atom
electrons). An atom's nth electron shell can accommodate 2n2 electrons. For example, the first shell can accommodate two electrons, the second shell eight
Electron_configuration
Electron in the outer shell of an atom's energy levels
valence electrons are electrons in the outermost shell of an atom, and that can participate in the formation of a chemical bond if the outermost shell is not
Valence_electron
Tabular arrangement of the chemical elements
(period) is started when a new electron shell has its first electron. Columns (groups) are determined by the electron configuration of the atom; elements
Periodic_table
Process in which a proton-rich nuclide absorbs an inner atomic electron
electrically neutral atom absorbs an inner atomic electron, usually from the K or L electron shells. This process thereby changes a nuclear proton to
Electron_capture
Energy needed to remove an electron
involves removing an electron from a lower electron shell, the greatly decreased distance between the nucleus and the electron also increases both the
Ionization_energy
Elementary particle with negative charge
These valence electrons also facilitate all types of chemical reactions by being transferred or shared between atoms. The inner electron shells make up the
Electron
Decrease in attraction between an electron and the nucleus
material sciences. The wider the electron shells are in space, the weaker is the electric interaction between the electrons and the nucleus due to screening
Shielding_effect
Function describing an electron in an atom
energies of certain sub-shells become very similar and therefore, the order in which they are said to be populated by electrons (e.g., Cr = [Ar]4s13d5
Atomic_orbital
Chemical rule of thumb
elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas
Octet_rule
Notation for conserved quantities in physics and chemistry
valence electron is in the shell with energy level 6, so an electron in caesium can have an n value from 1 to 6. The average distance between the electron and
Quantum_number
Model for predicting molecular geometry
Valence shell electron pair repulsion (VSEPR) theory (/ˈvɛspər, vəˈsɛpər/ VESP-ər, və-SEP-ər) is a model used in chemistry to predict the geometry of individual
VSEPR_theory
Different states of quantum systems
an electron shell, or principal energy level, may be thought of as the orbit of one or more electrons around an atom's nucleus. The closest shell to the
Energy_level
Inner-shell electron of an atom
Core electrons are the electrons in an atom that are not valence electrons and do not participate as directly in chemical bonding. The nucleus and the
Core_electron
Number assigned to each electron shell in an atom
mechanics, the principal quantum number (n) of an electron in an atom indicates which electron shell or energy level it is in. Its values are natural numbers
Principal_quantum_number
Chemical bond by sharing of electron pairs
shell of a carbon atom is the n = 2 shell, which can hold eight electrons, whereas the outer (and only) shell of a hydrogen atom is the n = 1 shell,
Covalent_bond
Isotope of helium
is the second simplest atom (hydrogen is the simplest), but the extra electron introduces a third "body", so its wave equation becomes a "three-body problem"
Helium-4
Chemical element with atomic number 13 (Al)
example of a diagonal relationship. The underlying core of electrons under aluminium's valence shell is that of the preceding noble gas, whereas those of the
Aluminium
Chemical element with atomic number 2 (He)
show that each electron in helium partly screens the nucleus from the other, so that the effective nuclear charge Zeff which each electron sees is about
Helium
Quantum number denoting orbital angular momentum
principal quantum number n (electron shell), the possible values of ℓ are the integers from 0 to n − 1. For instance, the n = 1 shell has only orbitals with
Azimuthal_quantum_number
Imaging technique for solid chemical analysis
Electron probe microanalysis (EPMA), also known as electron probe X-ray microanalysis, electron microprobe analysis (EMPA) or electron probe analysis (EPA)
Electron_probe_microanalysis
Atomic model introduced by Niels Bohr in 1913
screening effect due to the inner-shell and other electrons (see Electron shell and the later discussion of the "Shell Model of the Atom" below). This was
Bohr_model
Development framework built on Chromium
Electron (formerly known as Atom Shell) is a free and open-source software framework developed and maintained by OpenJS Foundation. The framework is designed
Electron_(software_framework)
Chemical analysis technique
energy levels or electron shells bound to the nucleus. The incident beam may excite an electron in an inner shell, ejecting it from the shell while creating
Energy-dispersive X-ray spectroscopy
Energy-dispersive_X-ray_spectroscopy
Particle, atom or molecule with a net electrical charge
or loss of electrons to the valence shell (the outer-most electron shell) in an atom . The inner shells of an atom are filled with electrons that are tightly
Ion
Pair of valence electrons which are not shared with another atom in a covalent bond
outermost electron shell of atoms. They can be identified by using a Lewis structure. Electron pairs are therefore considered lone pairs if two electrons are
Lone_pair
Development of the table of chemical elements
arrangement of the chemical elements, structured by their atomic number, electron configuration and recurring chemical properties. In the basic form, elements
History_of_the_periodic_table
Principle of atomic physics
number, one proton and one electron are added each time to the neutral atom. The maximum number of electrons in any shell is 2n2, where n is the principal
Aufbau_principle
Topics referred to by the same term
Atom shell may refer to either what is properly called an electron shell or an atomic orbital that makes up an electron subshell. Atom shell may also
Atom_shell
Form of microscopy using an electron beam
This is approximately the amount of energy needed to remove an inner-shell electron from a carbon atom, which can be taken as evidence that there is a significant
Electron energy loss spectroscopy
Electron_energy_loss_spectroscopy
Physical phenomenon
electrons. It occurs when an inner-shell vacancy in an atom is filled by an electron, releasing energy that causes the emission of another electron from
Auger_effect
Natural number
our modern digit. The first magic number - number of electrons in the innermost electron shell of an atom. The chemical element with atomic number 2
2
Column of elements in the periodic table of the chemical elements
have similar physical or chemical characteristics of the outermost electron shells of their atoms (i.e., the same core charge), because most chemical
Group_(periodic_table)
Analytical technique used specifically in the study of surfaces
core state electron can be removed leaving behind a hole. As this is an unstable state, the core hole can be filled by an outer shell electron, whereby
Auger_electron_spectroscopy
is the distance from the center of the nucleus to the outermost shell of an electron. Since the boundary is not a well-defined physical entity, there
Atomic radii of the elements (data page)
Atomic_radii_of_the_elements_(data_page)
Group of highly reactive chemical elements
effect, when an atom has more than one electron shell, each electron feels electric repulsion from the other electrons as well as electric attraction from
Alkali_metal
Process where an excited nucleus ejects an orbital electron from its atom
of finding the electron within the nucleus. In internal conversion, the wavefunction of an inner shell electron (usually an s electron) penetrates the
Internal_conversion
Smallest unit of a chemical element
outermost electron shell of an atom in its uncombined state is known as the valence shell, and the electrons in that shell are called valence electrons. The
Atom
Diagrams for the bonding between atoms of a molecule and lone pairs of electrons
losing, or sharing electrons until they have achieved a valence shell electron configuration with a full octet of (8) electrons, hydrogen instead obeys
Lewis_structure
Elements with atomic numbers 57-70
lanthanides are f-block elements, corresponding to the filling of the 4f electron shell. Lutetium is a d-block element (thus also a transition metal), and on
Lanthanide
Chemical element with atomic number 19 (K)
of the alkali metals, all of which have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive
Potassium
Sudden increase in x-ray absorption
innermost electron shell of the atoms interacting with the photons. The term is based on X-ray notation, where the innermost electron shell is known as
K-edge
Quantum mechanics principle
explained if the electrons in an atom were connected or clustered in some manner. Groups of electrons were thought to occupy a set of electron shells around the
Pauli_exclusion_principle
Periodic table of the elements with eight or more periods
fact that 32 electrons are filled in the deeply buried 5g and 6f shells, instead of just 14 electrons being filled in the 4f and 5f shells in the lanthanides
Extended_periodic_table
Method of visualizing the relationship between elements
of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic
Period_(periodic_table)
Topics referred to by the same term
Mollusc shell Bivalve shell Gastropod shell Shell, of a brachiopod Turtle shell Armadillo shell Electron shell or a principal energy level of electrons outside
Shell
Different forms of the table of elements
periodic chart: Modernised version of 1882 Bayley 1989 — Seaborg's electron shell table: Up to Z = 168 1995 — Klein's table: Breaks at the start of each
Types_of_periodic_tables
Chemical data page
number of electrons per shell. For phosphorus (element 15) as an example, the concise form is [Ne] 3s2 3p3. Here [Ne] refers to the core electrons which are
Electron configurations of the elements
Electron_configurations_of_the_elements
Spin of an electron
physics, the electron magnetic moment, or more specifically the electron magnetic dipole moment, is the magnetic moment of an electron resulting from
Electron_magnetic_moment
Chemical element with atomic number 46 (Pd)
palladium the heaviest element having only one incomplete electron shell, with all shells above it empty. Palladium has the appearance of a soft silver-white
Palladium
F-block chemical elements
the 5f electron shell, although as isolated atoms in the ground state many have anomalous configurations involving the filling of the 6d shell due to
Actinide
Type of radioactive decay
and electron capture is the sole decay mode. If the captured electron comes from the innermost electron shell of the atom, called the K-shell, it is
Beta_decay
1914 confirmation of the atom's quantum nature
precursor of quantum mechanics and of the electron shell model of atoms. Its key feature was that an electron inside an atom occupies one of the atom's
Franck–Hertz_experiment
Tendency of an atom to attract a shared pair of electrons
more "pull" it will have on electrons) and the number and location of other electrons in the electron shells (the more electrons an atom has, the farther
Electronegativity
Chemical compound involving ionic bonding
pair of ions comes close enough for their outer electron shells (most simple ions have closed shells) to overlap, a short-ranged repulsive force occurs
Salt_(chemistry)
Topics referred to by the same term
unfit for military service 4F correlator, in Fourier optics The 4f electron shell Section 4(f) of the United States DOT act of 1966, which regulates acquiring
4F
Gas which does not chemically react under the specified conditions
the tendency for non-reactivity is due to the valence, the outermost electron shell, being complete in all the inert gases. This is a tendency, not a rule
Inert_gas
Measurement in molecular physics
same as atomic diameter defined in terms of the size of the atom's electron shell, which is generally a lot smaller, depending on the exact definition
Kinetic_diameter
Use of mathematical groups in magnetochemistry
unpaired electron in the metal ion's valence electron shell, like Ti3+, and complexes of ions that have a single "vacancy" in the valence shell, like Cu2+
Double_group
Chemical element with atomic number 114 (Fl)
protons and neutrons form shells within a nucleus, analogous to electron shells. Noble gases are unreactive due to a full electron shell; similarly, it was theorized
Flerovium
Rule used to predict the ground state of an atom or molecule with open electron shells
molecule with one or more open electronic shells. The rule states that in a subshell of an atom, electrons are first singly filled with same spin before
Hund's rule of maximum multiplicity
Hund's_rule_of_maximum_multiplicity
Type of electron microscope
to detect in secondary electron images. Characteristic X-rays are emitted when the electron beam removes an inner shell electron from the sample, causing
Scanning_electron_microscope
Chemical element with atomic number 48 (Cd)
considered transition metals, in that they do not have partly filled d or f electron shells in the elemental or common oxidation states. The average concentration
Cadmium
Infection control process
Copper electron shell
Copper–silver_ionization
Species of elementary particle
superposition. In atomic physics the principal quantum number of an electron specifies the electron shell in which it resides, which determines the energy level of
Flavour_(particle_physics)
Analytical technique in chemistry
energy to an electron in the inner shell of an atom. The absorption of this photon ejects the electron and leaves a hole in the atomic shell (see figure
Electron_spectroscopy
Set of adjacent groups
only) electrons in the 1s atomic orbital, although its chemical properties are more similar to the p-block noble gases in group 18 due to its full shell. Na
Block_(periodic_table)
Important atomic emission spectra
as being distinct orbits around the nucleus. Each energy level, or electron shell, or orbit, is designated by an integer, n as shown in the figure. The
Hydrogen_spectral_series
Chemical reaction that swaps a hydrogen radical between two molecules
with a closed electron shell, such as chromyl chloride. Hydrogen atom transfer can occur via a mechanism known as proton-coupled electron transfer. An
Hydrogen_atom_abstraction
X-rays characteristic of specific elements
Characteristic X-rays are emitted when outer-shell electrons fill a vacancy in the inner shell of an atom, releasing X-rays in a pattern that is "characteristic"
Characteristic_X-ray
Substance that is not chemically reactive
elements possessing a complete valence electron shell and thus are disinclined from altering their current electron configuration per the octet 'rule'. It
Chemically_inert
Decrease of ionic radii across the lanthanide series
lanthanide series, electrons are added to the 4f shell. This first f shell is inside the full 5s and 5p shells (as well as the 6s shell in the neutral atom);
Lanthanide_contraction
Class of extreme chemical compounds
compounds. The electron affinity is 0.080 eV, which is very close to zero. The helium atom is small, with the radius of the outer electron shell at 0.29 Å
Helium_compounds
Nano-scale semiconductor particles
of both two-dimensional and three-dimensional quantum dots exhibit electron shell-filling behavior. A "periodic table of classical artificial atoms" has
Quantum_dot
Chemical element with atomic number 97 (Bk)
accompanied by a 12% volume decrease and delocalization of the electrons at the 5f electron shell. No further phase transitions are observed up to 57 GPa. Upon
Berkelium
Theory of forces and subatomic particles
Electromagnetism is responsible for a wide range of phenomena including atomic electron shell structure, chemical bonds, electric circuits and electronics. Electromagnetic
Standard_Model
Chemical compounds containing at least one xenon atom
until the electrons return to the ground state. This entity is formed because the xenon atom tends to complete the outermost electron shell by adding
Xenon_compounds
Energy release on formation of anions
valence shell of the atom; a group 17 atom releases more energy than a group 1 atom on gaining an electron because it obtains a filled valence shell and therefore
Electron_affinity
Topics referred to by the same term
Shell model can mean: Nuclear shell model, how protons and neutrons are arranged in an atom nucleus Electron shell, how electrons are arranged in an atom
Shell_model
Waves or particles moving through space
it can knock electrons off atoms, creating ions. Ionization occurs when an electron is stripped (or "knocked out") from an electron shell of the atom,
Radiation
Object that has a magnetic field
elements have a partially occupied f electron shell (which can accommodate up to 14 electrons). The spin of these electrons can be aligned, resulting in very
Magnet
Number of protons found in the nucleus of an atom
quantum mechanics. The number of electrons in each element's electron shells, particularly the outermost valence shell, is the primary factor in determining
Atomic_number
lone pairs of valence electrons; it is also possible for electrons to occur individually as unpaired electrons. electron shell An orbital around the nucleus
Glossary_of_chemistry_terms
Measure of the size of an atom
as the radius increases; gray indicates lack of data. Electrons in atoms fill electron shells from the lowest available energy level. As a consequence
Atomic_radius
Molecular geometry
bonds and two lone pairs of the central atom (A) form a complete 8-electron shell. They have central angles from 104° to 109.5°, where the latter is consistent
Bent_molecular_geometry
Topics referred to by the same term
electron, as an outer shell electron that is associated with an atom Valence and conduction bands, as a conduction band electron relative to the electronic
Free_electron
Form of electromagnetic radiation
If the electron has enough energy, it can knock an orbital electron out of the inner electron shell of the target atom. After that, electrons from higher
X-ray
Fourth row in the periodic table of chemical elements
elements from gallium to krypton are the heaviest where all electron shells below the valence shell are filled completely. This is no longer possible in further
Period_4_element
interatomic distance a to the radius r of the 3d electron shell. When the magnetically important 3d electrons of adjacent atoms are relatively close to each
Bethe–Slater_curve
Field of physics that studies the atom
or other electrons). Electrons that populate a shell are said to be in a bound state. The energy necessary to remove an electron from its shell (taking
Atomic_physics
Group of low-reactive, gaseous chemical elements
other chemical substances, results from their electron configuration: their outer shell of valence electrons is "full", giving them little tendency to participate
Noble_gas
New Zealand physicist and chemist (1871–1937)
conductive effects of X-rays on gases, which led to the discovery of the electron, the results first presented by Thomson in 1897. Hearing of Henri Becquerel's
Ernest_Rutherford
Chemical element with atomic number 29 (Cu)
s-orbital electron on top of a filled d-electron shell and are characterized by high ductility and electrical and thermal conductivity. The filled d-shells in
Copper
Association of atoms to form chemical compounds
the single electron bond, a single bond, a double bond, or a triple bond; in Lewis's own words, "An electron may form a part of the shell of two different
Chemical_bond
Core of an atom composed of nucleons
and neutrons. For larger nuclei, the shells occupied by nucleons begin to differ significantly from electron shells, but nevertheless, present nuclear theory
Atomic_nucleus
Excited atomic quantum state with high principal quantum number (n)
consisting of a nucleus with Z protons and the lower electron shells filled with Z-1 electrons. An electron in the spherically symmetric Coulomb potential has
Rydberg_atom
Type of microscope with electrons as a source of illumination
An electron microscope is a microscope that uses a beam of electrons as a source of illumination. It uses electron optics that are analogous to the glass
Electron_microscope
Atomic nuclear process
is found in the same ores as zirconium, which shares the same outer electron shell configuration and thus has similar chemical properties. Their nuclear
Neutron_capture
Specific recurring patterns that are present in the modern periodic table
down a group. This is because in periods, the valence electrons are in the same outermost shell. The atomic number increases within the same period while
Periodic_trends
Number describing angular momentum along an axis
quantum number is a quantum number used to distinguish quantum states of an electron or other particle according to its angular momentum along a given axis
Magnetic_quantum_number
ELECTRON SHELL
ELECTRON SHELL
Male
English
Short form of English unisex Shelley, SHELL means "clearing near a ledge/slope."
Boy/Male
Assamese, Bengali, Indian, Tamil
To Choose; Selection
Boy/Male
Muslim/Islamic
Selection choice
Surname or Lastname
English
English : variant spelling of Shelley.
Boy/Male
Arabic, Hindu, Indian, Muslim
Election; Last Dream
Male
English
English surname transferred to unisex forename use, derived from the name of various places SHELLEY means "clearing near a ledge/slope."
Female
English
English name derived from the vocabulary word, from Greek kyanos, CYAN means "dark blue" and "lapis lazuli." The color cyan is also sometimes called blue-green, electric blue, and turquoise.Â
Boy/Male
Biblical
Election; he that is chosen.
Biblical
election; he that is chosen;he will choose;chooser; God does choose;
Boy/Male
Muslim
Choice, Preference, Selection
Boy/Male
Arabic
Electric Light
Female
Italian
Italian form of Latin Electra, ELETTRA means "bright, shining."
Surname or Lastname
English
English : habitational name from Shell, a place in Worcestershire, so named from Old English scylf ‘bank’, ‘shelf’.Jewish (Ashkenazic) : ornamental name from German Schelle ‘bell’.Americanized spelling of German Schall or Schill.
Boy/Male
English American
A sometimes used as an independent name. Also, in England, 'Ernie' refers to the Electronic...
Girl/Female
American, Hindu, Indian
Selection
Boy/Male
Arabic, Muslim, Sindhi
Selection; Choice
Boy/Male
Muslim
Selection, Choice
Girl/Female
Australian, Danish, Greek
Bright; Shining
Girl/Female
Greek
Sparkling. The fiery sun. Mythological daughter of Agamemnon. In literature she was a central...
Boy/Male
Arabic, Muslim
Choice; Preference; Selection
ELECTRON SHELL
ELECTRON SHELL
Girl/Female
Hindu, Indian, Marathi, Sanskrit
Loving Heights
Boy/Male
Hindu
Famous, Renowned person, Bright
Surname or Lastname
English
English : habitational name from the city of Bath (see Bath 1) or from Bathe Barton in Devon, which is named with the same word.German : from a Germanic personal name formed with the element badu ‘battle’.
Girl/Female
British, English, Latin
Joy; Gladness
Girl/Female
Bengali, Hindu, Indian
Moon
Girl/Female
Indian, Tamil
Good
Boy/Male
Tamil
Lord of the mind, God of mind
Boy/Male
Tamil
(Father of draupad)
Girl/Female
Australian, Hindu, Indian, Jain
Goddess Parvati
Female
Hindi/Indian
(ਕੌਰ) Hindi name KAUR means "princess."
ELECTRON SHELL
ELECTRON SHELL
ELECTRON SHELL
ELECTRON SHELL
ELECTRON SHELL
n.
Amber; also, the alloy of gold and silver, called electrum.
a.
Belonging to the electro-chronograph, or recorded by the aid of it.
n.
A lesson or selection, esp. of Scripture, read in divine service.
n.
One versed in electro-biology.
n.
The art or science of constructing or using the electric telegraph; the transmission of messages by means of the electric telegraph.
a.
Alt. of Electro-metrical
a.
Of or pertaining to electro-kinetics.
a.
Producing electro-motion; producing, or tending to produce, electricity or an electric current; causing electrical action or effects.
a.
Pertaining to electro-ballistics.
n.
Alt. of Electro-puncturing
a.
Alt. of Electro-dynamical
a.
The act of choosing; choice; selection.
a.
Pertaining to the movements or force of electric or galvanic currents; dependent on electric force.
n.
An election held by itself, not at the time of a general election.
a.
Pertaining to an election or to electors.
a.
Made of electrum, an alloy used by the ancients.
n.
An instrument for measuring the strength of electro-dynamic currents.
a.
Pert. to, or caused by, electro-capillarity.
a.
Of or pertaining to electro-chemistry.