Which of the following electronic configurati | vedclass

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(C) The $s-$block elements are those in which the last electron enters the outermost $s-$orbital.Their general valence shell electronic configuration

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Both $(A)$ and $(B)$

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(C) The $s-$block elements are those in which the last electron enters the outermost $s-$orbital.Their general valence shell electronic configuration is $ns^{1-2}$.Option $(A)$ represents Copper $(Cu)$,which has the configuration $[Ar] 3d^{10} 4s^1$. Since the last electron enters the $s-$orbital,it is considered an $s-$block element in terms of valence shell configuration,although it is a transition metal.Option $(B)$ represents Potassium $(K)$,which has the configuration $[Ar] 4s^1$. This is a typical $s-$block element.Since both configurations end in an $s^1$ orbital,both belong to the $s-$block category based on the valence electron criteria.

Compound	Percentage proportion
$1. CaO$	$d. 50-60\%$
$2. Al_2O_3$	$a. 5-10\%$
$3. SO_3$	$b. 1-3\%$

Which of the following electronic configurations belongs to $s-$block elements?

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