State true or false:(Give reason to support your answer)
1)Chlorine is more electronegative than fluorine.
2)Francium has greater atomic radius, lower Ionisation energy,electron affinity & electronegativity than Caesium.

Asked by rickykumar00001 | 11th Jun, 2015, 01:49: PM

Expert Answer:

1)False
Fluorine( E.N = 4) is more electronegative than chlorine(E.N = 3.0).
The effect of an increase in the atomic size overcomes the effect of an increase in the nuclear charge.So as we move down the group electronegativity decreases.
2)True
As we move down in a group, atomic size increases due to successive addition of shells. This increase in the size overcomes the effect of an increase in the nuclear charge. So the ionisation energy, electron affinity and electronegativity decreases.

Answered by Vaibhav Chavan | 11th Jun, 2015, 06:19: PM