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Describe the theory associated with the radius of an atom as it:
(a) gains an electron (b) loses an electron ?

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Atomic radii is defined as the distance from the centre of the nucleus to outermost shell containing the electrons. a) Along a period in periodic table, the atomic radii of the elements generally decreases from left to right because the nuclear charge gradually increases on the addition of electron in...
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Atomic radii is defined as the distance from the centre of the nucleus to outermost shell containing the electrons.

a) Along a period in periodic table, the atomic radii of the elements generally decreases from left to right because the nuclear charge gradually increases on the addition of electron in a shell. As a result, electrons gets attracted more and more towards nuclei.

b) When an atom loses an electron, the number of electron decreases by one while the nuclear charge remains the same. Therefore, interelectronic repulsion in the atom decreases. As a result, the effective nuclear charge increases and hence radius of an atom decreases.

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