The element having the electronic configuration 1 s^2 , 2 s^2 ,2 … - Vidyadip

MCQ

The element having the electronic configuration $1{s^2},$ $2{s^2}\,2{p^6},\,3{s^2}\,3{p^1}$ is

A
A transition element
✓
A representative element
C
An inert gas
D
An inner-transition element

✓

Answer

Correct option: B.

A representative element

b
$(b)$ A representative element as last ${e^ - }$enters $p$-orbital.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

The correct statement in respect of protein haemoglobin is that it

Halogen acid used in the preparation of aqua regia is

For a first order reaction $A \to $ products, the concentration of $[A]$ is reduced from $2\,M$ to $0.125\ M$ in one hour, the $t_{1/2}$ of this reaction (in $\min$) is

Which of the following is the correct plot for the probability density $\psi^{2}( r )$ as a function of distance ' $r$ ' of the electron form the nucleus for $2 s$ orbital?

$CH \equiv CH\mathop {\xrightarrow{{{H_2}O/H{g^{2 + }}}}}\limits_{{H_2}S{O_4}} X\xrightarrow{{LiAl{H_4}}}Y\xrightarrow{{{P_4}/B{r_2}}}Z$ Here $Z$ is

The rate law expression for the reaction $aA + bB \to P$ is rate $= K [A]^p [B]^q$ The order of the reaction is

$\mathrm{CO}_{2}$ gas is bubbled through water during a soft drink manufacturing process at $298\, \mathrm{~K}$. If $\mathrm{CO}_{2}$ exerts a partial pressure of $0.835$ bar then $x \,\mathrm{~m} \,\mathrm{~mol}$ of $\mathrm{CO}_{2}$ would dissolve in $0.9\,\mathrm{~L}$ of water. The value of $x$ is $.....$ (Nearest integer)

(Henry's law constant for $\mathrm{CO}_{2}$ at $298\, \mathrm{~K}$ is $1.67 \times 10^{3}$ $bar$)

The precipitation occurs if ionic concentration is

The position of equilibrium lies to the right in each of these reactions :

$N_2H_5 ^+ + NH_3$ $\rightleftharpoons $ $NH_4^+ + N_2H_4$

$NH_3 + HBr $ $\rightleftharpoons $ $NH_4^+ + Br^-$

$N_2H_4 + HBr$ $\rightleftharpoons $ $N_2H_5^+ + Br^-$

Based on this information, what is the order of acidic strength -

Among $B _2 H _6, B _3 N _3 H _6, N _2 O , N _2 O _4, H _2 S _2 O _3$ and $H _2 S _2 O _8$, the total number of molecules containing covalent bond between two atoms of the same kind is. . . .