the value of IP1, IP2 , IP3 and IP4 of an atom are respectively 7.5 eV, 25.6 eV , 48.6 eV, 170.6 eV. the electronic configuration of the atom will be--

A) 1s2,2s2,2p6,3s1

B)1s2,2s2,2p6,3s2,3p1

C)1s2,2s2,2p6,3s2,3p3

D)1s2,2s2,2p6,3s2

Pls. ans.

The correct answer is (b) 1s22s22p63s23p1. As the 4th ionisation potential is extremely large than the other three, it corresponds to removing an electron from closed shell, which is achieved when an atom loses three electrons. Hence the correct answer is (b). 

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