Question

Which of the following statement(s) is(are) correct?
(A) The AHeg for sulphur is more exothermic than that for oxygen.
(B) Successive ionization energies of an atom always increase.
(C) First ionization energy of P is greater than that of S.
(D) Chlorine has larger atomic size as well as -AHeg than that of fluorine​

Answer 1

option B and D are correct

Answer 2

A) An oxygen atom is smaller as compared to sulphur; so in oxygen, there is more inter-electronic repulsion than that of sulphur.

(B) Charge increases so size decrease and number of electrons per proton also decreases; so valence shell electron gradually becomes more tightly held by the nucleus. Hence ionization energies of an atom always increase.

(C) Valance shell electron configuration of As is ns

2

np

3

(half filled stable configuration) and valence shell electron configuration of Se is ns

2

np

4

(partial filled less stable configuration).

As=0.947MJ/mole;Se=0.941MJ/mole.

(D) Down the group atomic size increases. Fluorine experiences more inter electronic repulsion than that of chlorine; so fluorine has less electron affinity than that of chlorine.