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The element X. Y, Z and T have the indicated electronic configurations. Starting with the innermost shell, which is the most metallic element

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X=2,8,4

Y=2,8,8

Z=2,8,8,1

T=2,8,8,7

answer is C.

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$Z = 2, 8, 8, 1 . ∵$ it would donate e- more easily

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