Question

Atomic radii of the elements of the period II are as follows:-

Period II elements: Be B O N C Li
Atomic Radius: 111 88 66 74 77 152

(i)Arrange them in decreasing order of their atomic radii.
(ii)How does the atomic size vary on moving from left to right in a period?Explain why?
(iii)How will the tendency to lose electrons will vary on moving from left to right in this period II?

Answer 1

(i) Li, Be, B, C, N, O.

(ii) Due to the addition of a proton of the nucleus increases the positive charge and pulls the valence electrons inwards, the atomic radius decreases from left to right along a period.

(iii) The tendency to lose electrons will decrease along the period, due to the decreasing atomic radius.

Answer 2

(i) Li, Be, B, C, N, O

(ii) Due to the addition of a proton of the nucleus increases the positive charge and pulls the valence electrons inwards, the atomic radius decreases from left to right along a period.

(iii) The tendency to lose electrons will decrease along the period, due to the decreasing atomic radius.