Question

The first (ΔiH1) and the second (ΔiH2) ionization enthalpies (in kJ/mol) and the

(ΔegH) electron gain enthalpy (in kJ/mol) of a few elements are given below: [4]

Elements ΔH1 ΔH2 ΔegH

I 520 7300 -60

II 419 3051 -48

III 1681 3374 -328

IV 1008 1846 -295

V 2372 5251 +48

VI 738 1451 -40

Which of the above elements is likely to be :

(a) the least reactive element.

(b) the most reactive metal.

(c) the most reactive non-metal.

(d) the least reactive non-metal.​

Answer 1

The first (ΔiH1) and the second (ΔiH2) ionization enthalpies (in kJ/mol) and the

(ΔegH) electron gain enthalpy (in kJ/mol) of a few elements are given below: [4]

Elements ΔH1 ΔH2 ΔegH

I 520 7300 -60

II 419 3051 -48

III 1681 3374 -328

IV 1008 1846 -295

V 2372 5251 +48

VI 738 1451 -40

Which of the above elements is likely to be :

(a) the least reactive element.

(b) the most reactive metal.

(c) the most reactive non-metal.

(d) the least reactive non-metal.