Question

An atom X has 10 electrons. Using the Bohr Bury scheme, find how many electrons are present in K, L and M shells?

• A. K:8; L:2; M:0​
• B. K:2; L:5; M:3​
• C. K:2; L:3; M:5​
• D. K:2; L:8; M:0​

Answer 1

The correct option is D K:2; L:8; M:0​

The maximum number of electrons present in a shell in given by ${2n}^2$ where n is the number of that shell.

Atom X has 10 electrons.

• For K shell: n = 1. The maximum number of electrons present in a shell in given by ${2n}^2$ = 2
• For L shell: n = 2. The maximum number of electrons present in a shell in given by ${2n}^2$ = 8
• Hence, there will be 2 electrons in K shell and remaining 8 electrons in L shell. M shell will not accomodate any electron.