How does atomic radius increase or decrease horizontally or vertically across th

Question

How does atomic radius increase or decrease horizontally or vertically across the periodic table?

a. atomic radius decreases moving from left to right across a period and increases from top to bottom.

b. atomic radius increases moving left to right across a period and decreases from top to bottom.

c. atomic radius is sporadic unless moving you are moving across a period.

d. atomic radius increases diagonally across the periodic table.

e. none of the answers is correct.

I've already tried A & B for answers and they were counted wrong so.

Explanation / Answer

A:- a. atomic radius decreases moving from left to right across a period and increases from top to bottom.

Explanation:- Group: In a group the atomic radius gradually increases with increasing atomic number the differntiating electron enters into the new shells, hence number of shells increases, screening effect also increases, as a result the distance from the center point of the nucleus to outer most shell increases.

Period: In a period the atomic radius gradually decreases, with increasing the atomic number the number of shells are not increase, because the differentiating electron enters into same shell, but number of protons increases in the nucleus, as a result the effective nuclear charge increases, due to this the atomic radius decrease gradually across from left to right in a period.

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