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The electron affinity values of elements A,B,C and D are respectively $-135,-60,-200$ and $-348$ kJ mol^{-1}.The outer electronic configuration of element B is :

\[\begin {array} {1 1} (1)\;3s^2\;3p^5 & \quad (2)\; 3s^23P^4 \\ (3)\;3s^2sP^3 & \quad (4)\;3s^2 3p^2 \end {array}\]

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answered Nov 7, 2013 by pady_1
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