Chemistry - Atomic radius and ionisation energy
Atomic radius and ionisation energy
Atomic radius and ionisation energy are two properties of elements that
show clear trends in the periodic table.
Trends in atomic radius and ionisation energy depend on the strength of
the attraction of the electrons (especially outer-shell electrons) to the
The effective attraction between the outer-shell electrons and the nucleus
may be linked to the core charge.
The increase in core charge across a period helps to explain why atomic
radius decreases across periods 2 (Li to F) and 3 (Na to Cl). The noble
gases show an increase in radius because of the stability of noble gas
electron arrangements. This increasing attraction across the period
overrides the increase in the number of subatomic particles (protons,
neutrons and electrons) across the period.
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