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If the electronic configuration of an element is 1s2 2s2 2p6 3s2 3p6 3d2 4s2 , the four electrons involved in chemical bond formation will be .
(a) 3p6
(b 3p6, 4s2          
(c)  3p6, 3d2         
(d) 3d1,4s2

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The answer is (d). 3d2 ,4s2 because the bond formed will be the outermost electrons , the four electrons of 3d2,4s2 form chemical bond according to valence bond theory.
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It is 3d24s2 Not 3d14s2
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