1.

Which electronic configuration of an element has abnormally high difference between second and third ionization energy?(a) 1s2, 2s2,2p6,3s1(b) 1s2, 2s2, 2p6, 3s13p1(c) 1s2, 2s2, 2p6, 3s23p2(d) 1s2, 2s2, 2p6, 3s2

Answer»

The correct option is : (d) 1s2, 2s2, 2p6, 3s2

Explanation:

Abnormally high difference between 2nd and 3rd ionisation energy means that the element has two valence electrons, which is a case in configuration (d).



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