7

3.1

3.9

None of these

5.2 kJ

52 kJ

520 kJ

52 J

EA of X atom

EN of X atom

IP of X atom

None of these

F < He > Mg > N > O

He > F > N > O > Mg

He > O > F > N > Mg

N > F > He > O > Mg

The properties of elements are a periodic function of their atomic numbers.

Non metallic elements are less in number than metallic elements.

The first IEs of elements along a period do not vary in a regular manner with increase in Z.

For transition elements, the d subshells are filled with electrons monotonically with increase in Z.