4 an atom with 10 electrons must have how many shells? a 1 b 2 c 8 d 10

Explanation:

Step1: Recall electron - shell capacity

The first electron shell (K - shell) can hold a maximum of 2 electrons. The second electron 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 the remaining 8 electrons fill the second shell. So, it has 2 shells.

Answer:

B. 2