Question

(a)Atomic number of mg and al are 12 and 13 respectively. Write down their electronic configuration.
(b)mention the period of the modern periodic table to which the above two elements belong.give reason for your answer.

Answer 1

HEYA GM
1) ATOMIC NUMBER OF MG IS 12
Electronic configuration:- 1s2 2s2 2p6 3s2
and for
AL:- 1s2 2s2 2p6 3s2 3p1
2) Both the elements are located in 3`rd period of Periodic Table...
And in this Modern Periodic Table these both elements are placed in 2nd group and 13th ground Respectively..
Mg is in S-BLOCK
AL is in P-BLOCK.
Thank you.......⛈⛈⛈

Answer 2

a)
electronic configuration of magnesium
2,8,2

and aluminium is
2,8,3

b)

Mg
period 3

It belongs to 3 rd period as its electronic configuration is 1s2 2s2 2p6 3s2. As outer electronic configuration is having two electrons it belongs to 2nd group


Al
period 3