Question

Identify the properties of group 17 elements that show decreasing trend down the group.

i. Atomic radius

ii. Ionisation enthalpy

iii. Electronegativity

Options

• Only i, ii

• Only i, iii

• Only ii, iii

• All of the above

Answer 1

Only ii, iii

Explanation:

i. As the number of quantum shells grows, the atomic radius increases down the group. 

ii. As atomic size increases, the ionisation enthalpy reduces down the group. 

iii. As the group progresses, electronegativity diminishes.