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Which represents alkali metals (i.e. 1^st group metals) based on $I E_{1}$ and $I E_{2}$ values in kJ $m o l^{- 1}$

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$Z 550 (I E_{1}) 7500 (I E_{2})$

$M 700 (I E_{1}) 1400 (I E_{2})$

$X 500 (I E_{1}) 1000 (I E_{2})$

$Y 600 (I E_{1}) 2000 (I E_{2})$

answer is C.

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Detailed Solution

Z has biggest jump from $I E_{1}$ to $I E_{2}$ hence, it has 1 valence $e^{-}$ .

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