Question

ii. what is the atomic number of this atom? a. 3 b. 4 c. 5 d. 6

Explanation:

Step1: Recall atomic number concept

The atomic number of an atom is equal to the number of protons in the nucleus. In a neutral atom, it is also equal to the number of electrons.

Step2: Count electrons

Count the number of electrons ($e^-$) in the diagram. There are 3 electrons shown. Since in a neutral atom, number of electrons = number of protons = atomic number.

Answer:

A. 3