Question

Assertion: Electronegativity of the elements increases in a group.

Reason: As atomic size increases the tendency to lose electrons increases.​

Answer 1

(a) The tendency to lose an electron increases as we move down in group 1 because of decrease in force of attraction for outermost electron.

(b) The tendency to gain an electron decreases as we down in group 17 because of increase in atomic size. Fluorine has less electron gain enthalpy than chlorine because of its small size and high interelectronic repulsion with incoming electron.

Answer 2

Explanation:

Assertion

Electronegativity across a period increases and down the group decreases.

Reason

As we move down the group, basic character increases while as we move across a period its acidic character increases.

ANSWER:-

As electronegativity across a period increases and down the group decreases so,

as we move down the group, basic character increases while as we move across a period its acidic character increases