Question

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 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 go into the first shell and 8 electrons go into the second shell. Since all 10 electrons are accommodated in 2 shells, no more shells are needed.

Answer:

B. 2