Question

Explain why there is variation in atomic radius in a group and period?​

Answer 1

Answer:

Atomic radius decreases from left to right of a period and increases from top to bottom of a group. ... This is because the affective nuclear charge across a period (from left to right) increases, thereby attracting the electrons of the outermost orbitals towards the nucleus

Answer 2

Explanation:

Atomic radius declines as we move from left to right in a period. It happens because in a period, the external electrons are available in a similar valence shell so, the atomic number increments from left to right in a period, which results in increase in the effective nuclear charge. Therefore, the attraction of electrons towards the nucleus is increased.

Also, atomic radius declines as we move from top to bottom in the group. It happens because as we move down in a group then there is increase in principal quantum number(n) which brings about increase in the distance between nucleus and the valence electrons.

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