Question

Which of the following correctly represents the electronic distribution of magnesium atom?

1,8,3

3,8,1

2,8,2

8,2,2​

Answer 1

$\Large{\underline{\sf{\blue{Required\:Answer:-}}}}$

Distrubition of electrons from one shell to another shell occurs only when the shell is completly filled.

$\boxed{ \sf{\purple{Number \: of \: electrons \: that \: can \: be \: accomodated \: in \: a \:shell = 2 {n}^{2} }}}$

Here ,

• n is Shell number

Number of electrons K shell can accomodate = 2(1)² = 2

Number of electrons L shell can accomodate = 2(2)² = 8

Number of electrons M shell can accomodate = 2(3)² = 18

Number of electrons N shell can accomodate = 2(4)² = 32

Now ,Magnesium has 12 electrons . So , 2 Electrons in K shell , 8 electrons in L shell and remaining 2 electrons in N shell .

Hence , The correct distribution of electrons of Magnesium atom is 2 , 8 , 2.

Answer 2

Answer:

\Large{\underline{\sf{\blue{Required\:Answer:-}}}}

RequiredAnswer:−

Distrubition of electrons from one shell to another shell occurs only when the shell is completly filled.

\boxed{ \sf{\purple{Number \: of \: electrons \: that \: can \: be \: accomodated \: in \: a \:shell = 2 {n}^{2} }}}

Numberofelectronsthatcanbeaccomodatedinashell=2n

2

Here ,

n is Shell number

Number of electrons K shell can accomodate = 2(1)² = 2

Number of electrons L shell can accomodate = 2(2)² = 8

Number of electrons M shell can accomodate = 2(3)² = 18

Number of electrons N shell can accomodate = 2(4)² = 32

Now ,Magnesium has 12 electrons . So , 2 Electrons in K shell , 8 electrons in L shell and remaining 2 electrons in N shell .

Hence , The correct distribution of electrons of Magnesium atom is 2 , 8 , 2.