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Q.

The electron gain enthalpy values of four successive elements A, B, C and D of 3rd period are respectively –135, –60, –200 and –348kJ/mole. The outer electronic configuration of element 'B; is

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a

3s2 3p5

b

3s2 3p4

c

3s2 3p3

d

3s2 3p2

answer is C.

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Electron gain enthalpy values of P(-60KJ)
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