Question

An atom has an atomic number of 12 and a mass number of 25. How many neutrons does the atom have?

12
13
25
37

Answer 1

25-12= 13. The mass number is the atomic number plus the no. of neutrons

Answer 2

The correct answer for the number of neutrons in this atom is: 13

Step-by-step explanation:

Hello! Let's solve this!

The atomic number indicates the number of protons in the nucleus.

The mass number is the sum of protons and neutrons in the nucleus.

So, we have to make the difference between both numbers.

25-12 = 13

The correct answer for the number of neutrons in this atom is: 13