Question

2.Whichofthefollowingcorrectlyreprese ntstheelectronicdistributionintheMgatom?

a)3,8,1

b)2,8,2

c)1,8,3

d)8,2,1​

Answer 1

Answer:

Option (B) is correct answer

Explanation:

Magnesium (Mg) has atomic number 12.

Refer to formula of number of electrons in a shell (i.e. 2n²)

Thus 1st shell has 2 electrons

2nd shell has 8 electrons

Thus, last shell has 12 - (8+2) = 2 electrons

So, electronic configuration of mg is 2,8,2