Question

Long answer type questions

1. What is Atomic radius? Define each type of Atomic radius and explain their trends in periodic table.
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Answer 1

The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons.

As the atomic number increases along each row of the periodic table, the additional electrons go into the same outermost shell; whose radius gradually contracts, due to the increasing nuclear charge. ... Therefore, atomic radius decreases. Down the groups, atomic radius increases.

Answer 2

Answer:

Atomic radius is distance from centre of nucleus to the valence of electrons.

Explanation:

It increases down the group because number of shells increase simultaneously.

It decreases slightly across a period because charge on nucleus increases( charge on nucleus increases which means nucleus exerts a greater pull on electrons)

Atomic radii maybe of various types including cationic, anionic, covalent radii etc.