Question

Which of the following is the maximum number of electrons than can be present in M-shell?

(a) 2 

(b) 8 

(c) 18 

(d) 32

Answer 1

(c) 18

Maximum occupancy of electrons in a given orbit is given by 2n² where 'n' represents number of orbit. K = 1, L = 2, M = 3 N = 4 and so on. The last shell of any atom can only accomodate 8 electrons only. The outermost electrons are called valence electrons.