Question

Which of the following arrangements represent possible presentations of Bohr’s model of an atom correctly?

• A.
• B.
• C.
• D.

Answer 1

Answer: (A), (C), (D)

The correct options are
A

C

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 (n=1) = 2 $\times$ 1${}^2$ = 2
Second orbit or L-shell (n=2) = 2 $\times$ 2${}^2$ = 8
Third orbit or M-shell (n=3) = 2 $\times$ 3${}^2$ = 18
Fourth orbit or N-shell (n=4) = 2 $\times$ 4${}^2$= 32 and so on.