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

Vedclass · Accepted Answer

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

Vedclass · Answer

(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.

List-$I$ Elements	List-$II$ Colour imparted to the flame
$A. K$	$I. Violet$
$B. Ca$	$II. Brick Red$
$C. Sr$	$III. Crimson Red$
$D. Ba$	$IV. Apple Green$

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

Similar Questions

Match List-$I$ with List-$II$

List-$I$ Elements List-$II$ Colour imparted to the flame

$A. K$ $I. Violet$

$B. Ca$ $II. Brick Red$

$C. Sr$ $III. Crimson Red$

$D. Ba$ $IV. Apple Green$

Choose the correct answer from the options given below:

Which of the following is an $\text{Incorrect}$ statement?

The correct solubility order is/are:
$I. CaCO_3 > SrCO_3 > BaCO_3$
$II. Li_2CO_3 < Na_2CO_3 < K_2CO_3$
$III. K_2CO_3 < Rb_2CO_3 < Cs_2CO_3$
$IV. Na_2CO_3 > K_2CO_3 > Rb_2CO_3$

$A$ white solid '$A$' on heating produces a gas that turns lime water milky,and the remaining solid residue is yellow when hot but turns white on cooling. The solid '$A$' is:

Assertion : $s-$Block elements do not occur free in nature.
Reason : $s-$Block elements are highly electropositive in nature.

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