Question

What is an example of an atomic number​

Answer 1

Answer: in a sodium atom, there are 11 electrons and 11 protons. Thus the atomic number of Na atom = number of electrons = number of protons = 11.

Step-by-step explanation:

Answer 2

The circled number in red is the atomic number.

(The site I used for this example is ptable.com. Very useful periodic table!)