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trends of the atomic radii (and of various other chemical and physical properties of the elements) can be explained by the electron shell theory of the atom;
Atomic radii of the elements (data page)
Atomic_radii_of_the_elements_(data_page)
Measure of the size of an atom
and others in 1967. The values are in picometres (pm). Atomic radii of the elements (data page) Chemical bond Covalent radius Bond length Steric hindrance
Atomic_radius
elements Abundances of the elements (data page) — Earth's crust, sea water, Sun and Solar System Abundance of elements in Earth's crust Atomic radii of
List of data references for chemical elements
List_of_data_references_for_chemical_elements
Size of an atom's imaginary sphere representing how close other atoms can get
volume" can have any number of definitions depending on the method of measurement. Atomic radii of the elements (data page) van der Waals force van der
Van_der_Waals_radius
Tabular arrangement of the chemical elements
between the periods (except in the s-block) that is sometimes known as secondary periodicity: elements in even periods have smaller atomic radii and prefer
Periodic_table
Remaining elements, making up only about 2% of the universe, were largely produced by supernova nucleosynthesis. Elements with even atomic numbers are
Abundance of the chemical elements
Abundance_of_the_chemical_elements
Measure of the size of an atom that forms part of one covalent bond
30 elements in 48 crystals with subpicometer accuracy. Atomic radii of the elements (data page) Ionization energy Electron affinity Electron configuration
Covalent_radius
Type of chemical bond in metals
radii of the elements (data page) Bonding in solids – Classification of bondings Metal aromaticity – Concept of aromaticity extended to metals If the
Metallic_bonding
1989). "Deriving a formula for nuclear radii using the measured atomic masses of elements". American Journal of Physics. 57 (4): 344–346. Bibcode:1989AmJPh
Shape_of_the_atomic_nucleus
Smallest unit of a chemical element
from the original on 16 October 2005. Ghosh, D.C.; Biswas, R. (2002). "Theoretical calculation of Absolute Radii of Atoms and Ions. Part 1. The Atomic Radii"
Atom
Decrease of ionic radii across the lanthanide series
post-lanthanide elements. The atomic radii of the lanthanides also decreases across the group, but not uniformly as is the case with the 3+ ions: The term was
Lanthanide_contraction
Chemical element with atomic number 6 (C)
but close to most of the nearby nonmetals, as well as some of the second- and third-row transition metals. Carbon's covalent radii are normally taken
Carbon
Overview of and topical guide to chemistry
of the elements (data page) – ionization energies (in eV) and molar ionization energies (in kJ/mol) Atomic radii of the elements (data page) – atomic
Outline_of_chemistry
Chemical element with atomic number 72 (Hf)
the same number of valence electrons and are in the same group. Also, their relativistic effects are similar: The expected expansion of atomic radii from
Hafnium
Any of the fifteen lanthanides plus scandium and yttrium
rare-earth elements and decreasing atomic radii throughout the series causes chemical variations. Europium is exempt of this classification as it has two
Rare-earth_element
Group of chemical elements
CRC Handbook of Chemistry and Physics (84th ed.). Boca Raton, FL: CRC Press. Slater, J. C. (1964). "Atomic Radii in Crystals". Journal of Chemical Physics
Halogen
Tendency of an atom to attract a shared pair of electrons
of the d-block contraction. Elements of the fourth period immediately after the first row of the transition metals have unusually small atomic radii because
Electronegativity
Chemical element with atomic number 117 (Ts)
and atomic number 117. It has the second-highest atomic number, the joint-highest atomic mass of all known elements, and is the penultimate element of the
Tennessine
Chemical element with atomic number 4 (Be)
in the universe, usually occurring as a product of the spallation of larger atomic nuclei that have collided with cosmic rays. Within the cores of stars
Beryllium
F-block chemical elements
f-block elements, the actinides show much more variable valence. They all have very large atomic and ionic radii and exhibit an unusually large range of physical
Actinide
Group of highly reactive chemical elements
down the group, the atomic radius must also increase down the group. The ionic radii of the alkali metals are much smaller than their atomic radii. This
Alkali_metal
Chemical element with atomic number 107 (Bh)
and radii of neutral and ionized species of elements 107 (bohrium) and 108 (hassium) from extended multiconfiguration Dirac–Fock calculations". The Journal
Bohrium
Chemical element with atomic number 20 (Ca)
Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 112. doi:10.1016/C2009-0-30414-6. ISBN 978-0-08-037941-8. "Standard Atomic Weights: Calcium"
Calcium
Theoretical chemical element with atomic number 119 (Uue)
(2008). "Nuclear half-lives for α -radioactivity of elements with 100 ≤ Z ≤ 130". Atomic Data and Nuclear Data Tables. 94 (6): 781–806. arXiv:0802.4161. Bibcode:2008ADNDT
Ununennium
Term used for certain metallic elements
controversial and ambiguous term for metallic elements with relatively high densities, atomic weights, or atomic numbers. The criteria used, and whether metalloids
Heavy_metals
Chemical element with atomic number 55 (Cs)
reactors. It has the largest atomic radius of all elements whose radii have been measured or calculated, at about 260 picometres. The German chemist Robert
Caesium
Void between celestial bodies
solar-wind pressure—the subsolar distance from the center of the Earth is typically 10 Earth radii. On the night side, the solar wind stretches the magnetosphere
Outer_space
Chemical element with atomic number 100 (Fm)
Fm and atomic number 100. It is an actinide and the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element
Fermium
Any of the chemical elements in the second row of the periodic table
elements. The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behavior of the elements as their atomic number
Period_2_element
Chemical element with atomic number 82 (Pb)
Lead has the highest atomic number of any stable element, and three of its isotopes are endpoints of major nuclear decay chains of heavier elements. Lead
Lead
Chemical element with atomic number 58 (Ce)
Ce and atomic number 58, and is a soft, ductile, and silvery-white metal that tarnishes when exposed to air. Cerium is the second element in the lanthanide
Cerium
Elements with atomic numbers 57-70
Lanthanides in the periodic table A lanthanide (/ˈlænθənaɪd/) is any of the 15 metallic chemical elements with atomic numbers 57–71, from lanthanum through
Lanthanide
Chemical element with atomic number 2 (He)
orbital of the same type. Because of this trend in the sizes of orbitals, a large difference in atomic radii between the first and second members of each
Helium
Chemical element with atomic number 52 (Te)
Tellurium is a chemical element; it has the symbol Te and atomic number 52. It is a brittle, mildly toxic, rare, silver-white metalloid. Tellurium is chemically
Tellurium
Category of metallic elements
successive increase in nuclear charge, and the latter therefore dominates. With some irregularities, atomic radii contract, ionisation energies increase,
Post-transition_metal
Type of very-high-resolution microscopy
demonstrated resolution on the order of fractions of a nanometer, more than 1000 times better than the optical diffraction limit. Atomic force microscopy (AFM)
Atomic_force_microscopy
Chemical element with atomic number 111 (Rg)
the ninth member of the 6d series of transition metals. Calculations on its ionization potentials and atomic and ionic radii are similar to that of its
Roentgenium
Periodic table of the elements with eight or more periods
effect of the relativistic contraction of the 8s orbital is that the atomic radii of these two elements should be about the same as those of francium
Extended_periodic_table
Chemical element with atomic number 62 (Sm)
in air. Samarium is calculated to have one of the largest atomic radii of the elements; with a radius of 238 pm, only potassium, praseodymium, barium
Samarium
Reaction that combines atomic nuclei
fusion. Nucleosynthesis via fusion, in the Big Bang and in stars, creates all elements lighter than nickel (atomic number 28). Fusion typically occurs via
Nuclear_fusion
Chemical element with atomic number 109 (Mt)
should be much like the platinum group metals. Calculations on its ionization potentials and atomic and ionic radii are similar to that of its lighter homologue
Meitnerium
Chemical element with atomic number 59 (Pr)
element; it has symbol Pr and atomic number 59. It is the third member of the lanthanide series and is considered one of the rare-earth metals. It is a soft
Praseodymium
Unit of length
dimensions of integrated circuit parts. The atomic (covalent) radii of phosphorus, sulfur, and chlorine are about 1 angstrom, while that of hydrogen is
Angstrom
Chemical element with atomic number 93 (Np)
symbol Np and atomic number 93. A radioactive actinide metal, neptunium is the first transuranic element. It is named after Neptune, the planet beyond
Neptunium
Spread of nuclear weapons
"Roots of Pakistan Atomic Scandal Traced to Europe", The New York Times, 19 February 2004, page A3. Bill Powell; Tim McGirk (14 February 2005). "The Man
Nuclear_proliferation
Chemical element with atomic number 14 (Si)
oxidation state, in tandem with increasing atomic radii, results in an increase of metallic character down the group. Silicon already shows some incipient
Silicon
Chemical element with atomic number 110 (Ds)
has symbol Ds and atomic number 110. It is extremely radioactive: the most stable known isotope, darmstadtium-281, has a half-life of approximately 14
Darmstadtium
Chemical element with atomic number 21 (Sc)
chemical element; it has symbol Sc and atomic number 21. It is a silvery-white metallic element found in the d-block of the periodic table. Usually, it is classified
Scandium
Star at the centre of the Solar System
rate. The radiative zone is the thickest layer of the Sun. It starts above the core at about 0.25 solar radii and out to about 0.7 solar radii. The zone
Sun
Type of 3D molecular model
a type of three-dimensional (3D) molecular model where the atoms are represented by spheres whose radii are proportional to the radii of the atoms and
Space-filling_model
within groups of elements. Mendeleev's law allowed him to build up a systematic periodic table of all the 66 elements then known based on atomic mass, which
History_of_chemistry
Chemical element with atomic number 104 (Rf)
its atomic number is high; lead (element 82) is one example of such a heavy element. The term "superheavy elements" typically refers to elements with
Rutherfordium
Chemical element with atomic number 9 (F)
Fluorine is a chemical element; it has the symbol F and atomic number 9. It is the lightest halogen and exists at standard conditions as pale yellow diatomic
Fluorine
Seventh planet from the Sun
Uranian radii ahead of it, a magnetopause at 18 Uranian radii, a fully developed magnetotail, and radiation belts. Overall, the structure of Uranus's
Uranus
Category of chemical elements
for the Elements, Hamish Hamilton, London, ISBN 9780425184677 Suresh CH & Koga NA 2001, "A consistent approach toward atomic radii", Journal of Physical
Nonmetal
Theoretical chemical element with atomic number 120 (Ubn)
(2008). "Nuclear half-lives for α -radioactivity of elements with 100 ≤ Z ≤ 130". Atomic Data and Nuclear Data Tables. 94 (6): 781–806. arXiv:0802.4161. Bibcode:2008ADNDT
Unbinilium
Group of chemical elements
All elements in this group are metals. The similarity of the metallic radii of cadmium and mercury is an effect of the lanthanide contraction. So, the trend
Group_12_element
and relatively small atomic radii, unlike metals, which are nearly all solid and close-packed, and mostly have larger atomic radii. If solid, they have
Properties of nonmetals (and metalloids) by group
Properties_of_nonmetals_(and_metalloids)_by_group
Chemical element with atomic number 38 (Sr)
organosamarium compounds due to the similar ionic radii of these elements (Sr2+ 118 pm; Eu2+ 117 pm; Sm2+ 122 pm). Most of these compounds can only be prepared
Strontium
Collapsed core of a massive star
collapse—that compresses the core past white dwarf star density to that of atomic nuclei. Surpassed only by black holes, neutron stars are the second-smallest
Neutron_star
Group of chemical elements
the same number of valence electrons and are in the same group. Also, their relativistic effects are similar: The expected expansion of atomic radii from
Group_4_element
Technique used for determining crystal structures and identifying mineral compounds
crystallography is the experimental science of determining the atomic and molecular structure of a crystal, in which the structure causes a beam of incident X-rays
X-ray_crystallography
Compact astronomical body
3-4 Schwarzschild radii from the centre of the black hole. The exact locations of the photon spheres depend on the magnitude of the black hole's rotation
Black_hole
Stream of charged particles from the Sun
ions and atomic nuclei of elements such as carbon, nitrogen, oxygen, neon, magnesium, silicon, sulfur, and iron. There are also rarer traces of some other
Solar_wind
Star in the constellation Draco
40% of the Sun's mass and nearly 50% of the Sun's radius. Compared to the Sun, it has a slightly higher proportion of elements with higher atomic numbers
Gliese_687
Chemical compound
electronegativities and atomic radii. When the properties of atoms are so highly similar, they often form extensive families of covalently bonded structures
Tetrasulfur_tetranitride
Chemical element with atomic number 30 (Zn)
Holden, Norman E.; Meijer, Harro A. J. (May 4, 2022). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry.
Zinc
Chemical element with atomic number 90 (Th)
(1969). The periodic system of chemical elements. Elsevier. pp. 315–316. ISBN 978-0-444-40776-4.. Rhodes, R. (2012). The Making of the Atomic Bomb (25th
Thorium
Group of elements in the periodic table
chemistry (the chemistry of metallic ions bound with molecules). Due to the effects of the lanthanide contraction, the decrease in ionic radii in the lanthanides
Group_5_element
Matter with biological processes
known as the habitable zone. The inner and outer radii of this zone vary with the luminosity of the star, as does the time interval during which the zone
Life
Hypothetical invisible cosmic material
radii; that paper's Figure 16 combines the optical data (the cluster of points at radii of less than 15 kpc with a single point further out) with the
Dark_matter
Third planet from the Sun
electrons of the solar wind are deflected by the magnetosphere; solar wind pressure compresses the day-side of the magnetosphere, to about 10 Earth radii, and
Earth
Life that does not originate on Earth
extrapolation from data about K-type stars For the purpose of this 1 in 5 statistic, Earth-sized means 1–2 Earth radii For the purpose of this 1 in 5 statistic
Extraterrestrial_life
Largest moon of Jupiter
embedded inside that of Jupiter; it is the only moon in the Solar System known to possess the feature. Its diameter is 4–5 Ganymede radii. The Ganymedian magnetosphere
Ganymede_(moon)
Interstellar comet in 2025
tholins in the comet's coma. Within the coma of 3I/ATLAS, small dust grains with 1 μm radii are ejected from the nucleus at fast speeds of 22 m/s, whereas
3I/ATLAS
Large, round non-stellar astronomical object
replace this account. The level of metallicity—an astronomical term describing the abundance of chemical elements with an atomic number greater than 2
Planet
Rate of temperature increase with depth in Earth's interior
processes. The mantle is mostly made up of high density minerals with higher concentrations of elements that have relatively small atomic radii, such as
Geothermal_gradient
Large self-illuminated object in space
express mass, luminosity, and radii in solar units, based on the characteristics of the Sun. In 2015, the IAU defined a set of nominal solar values (defined
Star
Type of crystal structure
> 1) layers of the ABO 3 lattice. Ruddlesden−Popper phases have a similar relationship to perovskites in terms of atomic radii of elements with A typically
Perovskite_(structure)
Brightest star in the constellation Lyra
higher atomic numbers than helium are termed "metals". The metallicity of Vega's photosphere is only about 32% of the abundance of heavy elements in the Sun's
Vega
Innermost Galilean moon of Jupiter
the Solar System, has the highest density and strongest surface gravity of any natural satellite, and the lowest amount of water by atomic ratio of any
Io_(moon)
Stellar core remnant
high as 1.33 M☉, the mass distribution is strongly peaked at 0.6 M☉, and the majority lie between 0.5 and 0.7 M☉. The estimated radii of observed white
White_dwarf
NASA spacecraft (2006–present)
bulk parameters (radii, masses) and orbits of Pluto and Charon Search for additional moons and any rings "The New Horizons flyby of the Pluto system was
New_Horizons
System of stars and interstellar matter
Tomotsugu (2005). "Total Galaxy Magnitudes and Effective Radii from Petrosian Magnitudes and Radii". The Astronomical Journal. 130 (4): 1535–1544. arXiv:astro-ph/0504287
Galaxy
Microscope that uses visible light
over the sample surface. Resolution in these cases is limited by the size of the probe; micromachining techniques can produce probes with tip radii of 5–10 nm
Optical_microscope
Computer graphics
them. In the space-filling model, atoms are drawn as solid spheres to suggest the space they occupy, in proportion to their van der Waals radii. Atoms that
Molecular_graphics
Substellar object
is in planets. The net result is that the radii of brown dwarfs vary by only 10–15% over the range of possible masses. Moreover, the mass–radius relationship
Brown_dwarf
Comparison of a wide range of lengths
1683:2015 Winter, Mark (2008). "WebElements Periodic Table of the Elements / Hydrogen / radii". Archived from the original on 18 December 2008. Retrieved
Orders_of_magnitude_(length)
Galaxy in the constellation Virgo
± 0.4 Schwarzschild radii, and is probably powered by a prograde accretion disk around the spinning supermassive black hole. The German-American astronomer
Messier_87
Property in optics
{n_{2}}{n_{1}}}\right)~.} The focal length of a lens is determined by its refractive index n and the radii of curvature R1 and R2 of its surfaces. The power of a thin lens
Refractive_index
Gas layer surrounding Venus
The magnetic field in the barrier reaches up to 40 nT. The magnetotail continues up to ten radii from the planet. It is the most active part of the Venusian
Atmosphere_of_Venus
Analytical technique to determine structure and composition of materials
However, for the EBS analysis of matrices containing light elements, the utilization of experimentally measured scattering cross-section data is also considered
Rutherford backscattering spectrometry
Rutherford_backscattering_spectrometry
Physics facility at CERN
moments and charge radii. The experiment uses the technique of collinear spectroscopy using lasers to access necessary atomic transitions. The Collinear Resonance
ISOLDE
Second brightest star in the southern constellation of Pictor
of the sky of 8 AU. For comparison, the orbital radii of the planets Jupiter and Saturn are 5.2 AU and 9.5 AU respectively. In the autumn of 2009 the planet
Beta_Pictoris
Study of the deformation of solids that touch each other
function of the normal contact force, the radii of curvature of both bodies and the modulus of elasticity of both bodies. Hertzian contact stress forms the foundation
Contact_mechanics
NASA satellite of the Explorer program
continued the study begun by earlier IMP spacecraft of the interplanetary space and magnetotail regions from a nearly circular orbit, near 37 Earth radii. This
Explorer_47
Physics of the Earth and its vicinity
mapped out the gross dimensions of the Earth's magnetic field, which extends about 10 Earth radii towards the Sun. The solar wind, a stream of charged particles
Geophysics
Nuclear research reactor in Oak Ridge, Tennessee
with an inside diameter of 1.584 in. (4.02 cm). The facilities are located concentric with the core on two circles of radii 15.43 in. (39.2 cm) and 17
High_Flux_Isotope_Reactor
Chess variant native to China
army of xiangqi pieces set up at the end of each of the board's three wide radii. In the centre of the board sits a triangular zone with certain features
Xiangqi
Computer simulations to discover and understand chemical properties
integration of the many-body equations of motion was carried out with analog computers. Some undertook the labor-intensive work of modeling atomic motion by
Molecular_dynamics
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