Question

What is Atomic mass

A: the mass of the atom based on the mass of an atom of oxygen-16
B: the mass of an atom based on the mass of an atom of carbon-12
c: the average mass of all isotopes
d: the mass of the atom based on the mass of an atom of hydrogen-1

Answer 1

The answer is B. Your welcome.

Answer 2

I think it’s , the sum of all protons and neutrons in the atomic nucleus.

Apologize if it’s wrong .