Question

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

• A.
• B.
• C.
• D.

Answer 1

Answer: (A), (B)

9

$\bullet$ The maximum number of electrons that can be accommodated in a shell is given by the formula $2n^2$, where $n$ is the shell number.$$\begin{array}{ccc}\text{Shell}& \text{Shell number, n}& \text{Maximum number of electrons}\\ \text{K}& \text{1}& \text{2}\\ \text{L}& \text{2}& \text{8}\\ \text{M}& \text{3}& \text{18}\end{array}$$$\bullet$ So, the innermost shell can have a maximum of 2 electrons and the second shell can have maximum of 8 electrons.