Question

An atom has a mass number of 9 and 5 neutrons. What is its atomic number?

OA. 14
O B. 11
OC. 4
OD. 19

Answer 1

4

Step-by-step explanation:

It should be 4

The mass is 9

There are 5 neutrons

There are 9 - 5 = 4 protons

So it is the 4th element on the periodic table.