Which of the followingstatement(s) is (are) correct ?

1.	Which of the followingstatement(s) is (are) correct ?
Answer» The electron affinity for sulphur is more exothermic than that for oxygen successive ionization energies of an ATOM always increase First ionization energy of As is greater than that of Se Chlorine has larger atomic SIZE as well as electron affinity than that of fluorine Solution :(A)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 decreaseand number of electrons per proton also decreases, so valence shell electron gradually BECOMES more tightly held by the nucleus. (C )valence shell electron configuration of As is `ns^2 np^2` (half filled stable configuration) and valence shell electron configuration of Se is `ns^2 np^4` (partially filled less stable configuration) As=0.947 Mj/mole, Se=0.941 Mj/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 chlorin.

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