MCQ
The valency shell of calcium contains
  • A
    $8$ electrons
  • B
    $6$ electrons
  • C
    $4$ electrons
  • $2$ electrons

Answer

Correct option: D.
$2$ electrons
d
(d) Valence shell configuration for $IIA$ group elements is : $n{s^2}$

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

Similar questions

A carbon-carbon triple bond in ethyne $( - C \equiv C - )$ consists of
Image
Residue (A) + HCl (dil.) $\rightarrow$ Compound (B)
Structure of residue (A) and compound (B)
Formed respectively is :
Total number of stereoisomers of the $1,3$ -dichlorocyclohexane is
Which of the following statement is not correct
Which of the following shall form an octahedral complex
The equilibrium constant for the reaction ${N_2}_{\left( g \right)} + {O_{2\left( g \right)}} \rightleftharpoons 2N{O_{\left( g \right)}}$ is $4\times10^{-4}$ at $200\, K$. In presence of a catalyst, equilibrium is attained ten times faster therefore, the equilibrium constant in presence of the catalyst at $200\, K$ is
$Mn\mathop {O_4^{ - 1}}\limits_{(aq)} \, + \,8\mathop {{H^ + }}\limits_{(aq)} \, + \,5{e^ - }\, \to \, M{n^{ + 2}}(aq)\, + \,4{H_2}O(l)\,;$ $E_1^o\, = \,1.51\,\,V$

$Mn{O_2}(s)\, + \,4{H^ + }(aq)\, + \,2{e^ - }\, \to \, M{n^{ + 2}}(aq)\, + \,2{H_2}O(l)\,;$ $E_2^o\, = \,1.21\,\,V$

$MnO_4^{ - 1}(aq)\, + \,4{H^ + }(aq)\, + \,3{e^ - }\, \to \, Mn{O_2}(s)\, + \,3{H_2}O(l)\,;$ $E_3^o\,?$

value of $E_3^o$ will be ............ $\mathrm{V}$

Solid $Ba(NO_3)_2$ is gradually dissolved in $1\times10^{-4}\, M\, Na_2CO_3$ solution. At what concentration of $Ba^{+2}$ the precipitation of $BaCO_3$ will start? (If $K_{sp}$ of $BaCO_3 = 5.1\times10^{-9}$)
The equation which is balanced and represents the correct product(s) is :
Which of the following equilibrium will shift in right side by increase in pressure?