Question

an atom with 10 electrons must have how many shells?
1
2
8
10

Explanation:

Step1: Recall electron - shell capacity

The first shell (K - shell) can hold a maximum of 2 electrons, and the second shell (L - shell) can hold a maximum of 8 electrons.

Step2: Distribute 10 electrons

For an atom with 10 electrons, 2 electrons fill the first shell and 8 electrons fill the second shell. Since all 10 electrons are accounted for in two shells, the number of shells is 2.

Answer:

2