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The atomic radius of a chemical element 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 are various non-equivalent definitions of atomic radius.
The covalent atomic radius (r cov) is half the internuclear distance in a molecule with two identical atoms bonded to each other, whereas the metallic atomic radius (r met) is defined as half the distance between the nuclei of two adjacent atoms in a metallic element.
16 wrz 2024 · Certain properties—notably atomic radius, ionization energies, and electron affinities—can be qualitatively understood by the positions of the elements on the periodic table. The major trends are summarized in the figure below.
The Royal Society of Chemistry's interactive periodic table features history, alchemy, podcasts, videos, and data trends across the periodic table. Click the tabs at the top to explore each section.
*1 Å = 100pm *Metallic radii for 12-coordination are given for all metals. Covalent radii are in parentheses. Ionic radii are for six-coordination.
Covalent radius. Gallery of images. When two atoms of the same kind are bonded through a single bond in a neutral molecule, then one half of the bond length is referred to as the covalent radius.
