Question

(a) What are the periods and groups in a periodic table ? Give two characteristics of each.
(b) In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging
to the same period and same group.
(c) Given alongside is a part of the periodic table. As we move vertically downward from
Li to Fr:
(i) What happens to the size of atoms?
(ii) What happens to their metallic character ?
(d) Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change?
(e) Rewrite the following statement after correction, if necessary :
Groups have elements with consecutive atomic numbers.​

Answer 1

Explanation:

(i) The elements in a group do not have consecutive atomic numbers. (ii) All the elements in a group have similar electronic configurations and show similar properties. (b) The size of atom decreases on moving from left to right in a period.