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Explain the terms: (a) Atomic radius (b) Ionization energy (c) Electron effinity Mention the units in which they are measured. How do they generally vary

(i) in a group, (ii) in a period?


Atomic radius:-
the distance from centre of nucleus to last orbit.it is measured in angstron
ionisation energy:-
the amount of energy required to remove the last electron from its valency shell.it is measured in electron volt.
electron affinity:-
the amount of energy required to release an electron in the valency shell of an atom.it is measured in electron volt
atomic radius decreases in a period while increases in a group
ionisation energy increases in a period while decreases in a group
electron affinity increases in a period while decreases in a group.
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