Question

If the atomic number of an element is 6 and its mass number is 15, how many neutrons are in the atom's nucleus?

Answer 1

Atomic Number is the same as the number of protons in an element.
Mass Number is the number of Protons + Neutrons in an element.

Atomic Number: 6 means 6 Protons
Mass Number: 15 means 15 atoms that are a proton/neutron.
We are given out of the 15 atoms, 6 of them are protons, so the other 9 must be Neutrons.

15 - 6 = 9 so there must be 9 Neutrons.

There are 9 Neutrons in atom's nucleus.

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Answer 2

¹⁵₆X
- 6 protons
- 6 electrons
- 15-6 = 9 neutrons

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