(a) The elements of the second period along with their atomic numbers in parentheses are given below : B (5), Be (4), O(8), N(7), Li (3), C (6), F (9) (i) Arrange them in the same order as they appear in the periodic table. (ii) Which element has the largest and smallest atom ? (b) Why does atomic radius change as we move from left to right in a period ?

(a) The elements of the second period along with their atomic numbers

1.	(a) The elements of the second period along with their atomic numbers in parentheses are given below : B (5), Be (4), O(8), N(7), Li (3), C (6), F (9) (i) Arrange them in the same order as they appear in the periodic table. (ii) Which element has the largest and smallest atom ? (b) Why does atomic radius change as we move from left to right in a period ?
Answer» Solution :(a) (i) Li (3), Be (4), B (5), C (6), N (7), O(8), F (9) (ii) The element Li has the largest atom. The element F has the smallest atom. ltbnrgt (b) Along a period, the nuclear CHARGE increases and the electrons are ATTRACTED more towards the nucleus. THEREFORE, the atomic size or atomic radius decreases as we move from left to the right along a period.