Question

how many protons are there in C-12 isotope? neutrons?

How did you get it?

Answer 1

Isotope notation works like this:

[element name] - [atomic mass]

In this case, you have an atom of carbon with an atomic mass of 12.

Do you know what the atomic number of carbon is?

Answer 2

6

Answer 3

Good! Now, what can you infer about the number of protons from that?

Answer 4

6

Answer 5

Atomic mass equals the number of protons plus the number of neutrons, so you should be able to determine the number of neutrons now.

Answer 6

how to find the number of neutrons?

Answer 7

Atomic mass - protons = neutrons, since both protons and neutrons have an atomic mass of 1.