Question

Among the element of the second period Li to ne pick out the element:
(i) with the highest first ionisation energy
(ii) with the highest electronegativity
(iii) with the largest atomic radius Give the area-son for your choice.

Answer 1

(i) The ionisation energy increases on going from left to right. Therefore, the element with the highest ionisation energy is Ne.

(ii)The electronegativity is electron- accepting tendency. This increases on going from left to right and decreases down the group. Therefore, the element with the highest electronegativity is F.

(iii)The atomic radius decreases across a period on going from left to right. Thus, the first element of any period should have the largest atomic radii. Here, Li has the largest atomic radii.