#BR CHARGE FREE#

Consequently, the smallest atom is helium with a radius of 32 pm, while one of the largest is caesium at 225 pm. On the periodic table of the elements, atomic radius tends to increase when moving down columns, but decrease when moving across rows (left to right).

A metallic radius is one-half the distance between the nuclei of two adjacent atoms in a crystalline structure, when joined to other atoms by metallic bonds. Covalent radius is the nominal radius of the atoms of an element when covalently bound to other atoms. An ionic radius is one-half the distance between the nuclei of two ions in an ionic bond. Van der Waals radius. In principle, Vana der Waals radius is half the minimum distance between the nuclei of two atoms of the element that are not bound to the same molecule.Therefore, there are various non-equivalent definitions of atomic radius.

#BR CHARGE FREE#

However, this assumes the atom to exhibit a spherical shape, which is only obeyed for atoms in vacuum or free space. The atomic radius of a chemical element is a measure of the distance out to which the electron cloud extends from the nucleus. It must be noted, atoms lack a well-defined outer boundary. The atomic radius of Bromine atom is 120pm (covalent radius).

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