Question

As we go along the period the atomic size decreases.

• A. True
• B. False

Answer 1

The correct option is A

True

The group IA atoms are largest in their horizontal period, because of lease effective nuclear charge(As the number of protons in the nucleus is less, the attractive force felt on the outer electrons is very low leading to least effective nuclear charge). As we go along the horizontal period the atomic no increase(The number of protons in the nucleus increases), which causes the increase in nuclear charge leading to smaller radii of the atom.