Question

what is the atomic number of this element?
a 15
b 17
c 35
d 52

Explanation:

Step1: Recall the definition of atomic number

The atomic number of an element is equal to the number of protons in its nucleus.

Step2: Identify the number of protons from the diagram

In the given diagram, it is clearly shown that there are \(17\) protons (\(17p\)).

Answer:

B. 17