If the atomic number of an element is 6 and its mass number is 14, how many neutrons are contained in the nucleus?

8 neutrons

Explanation:

The number of protons in the nucleus of an atom is called atomic number. It is characteristic of each element and it does not vary. On the other hand the number of neutrons can change in the case of isotopes.

The mass number is the sum of the protons and neutrons in the nucleus of an atom. So if you want to know how many neutrons are, you can subtract  the atomic number from the mass number.

So answering the question: mass number - atomic number = neutrons

14 - 6 = 8

2b2t

explanation:

2b2t