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Element W has two shells both of which are completely filled, element X has four electrons in the M shell, element Y has twice as many electrons in the L shell as in its K shell and element Z is chemically similar to element with electronic configuration 2, 8, 7. W, X, Y and Z could be respectively.

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An Intiative by Sri Chaitanya

He, Ne, F and N

Ar, C, S and Cl

Ne, Si, O and F

Ne, Si, C and F

answer is D.

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Detailed Solution

$\begin{array}{l} W = 2, 8 = Ne \\ X = 2, 8, 4 = Si \\ Y = 2, 4 = C \\ Z = 2, 7 (similar to CI) \end{array}$

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