Question

Which of the following arrangement/arrangements of the electrons does/do not represent the Bohr’s model of an atom correctly?

• A.
• B.
• C.
• D.

Answer 1

Answer: (B), (D)

The correct options are
B

D

The maximum number of electrons present in a shell is given by the formula 2n${}^2$, where 'n' is the orbit number or energy level index, 1,2,3,…. Hence the maximum number of electrons in different shells are as follows:

-first orbit or K-shell will be = 2 $\times$ 1${}^2$ = 2,

-second orbit or L-shell will be = 2 $\times$ 2${}^2$ = 8,

-third orbit or M-shell will be = 2 $\times$ 3${}^2$ = 18,

-fourth orbit or N-shell will be = 2 $\times$ 4${}^2$= 32, and so on.