Question

The sum of protons and neutrons in an atomic nucleus is the __________.

a) Atomic Number

b) Atomic Mass

c) Balance Number

d) Charge Number

Answer 1

Atomic number

i.e hydrogen=

1 proton, 0 neutrons=

atomic number 1

Answer 2

The sum of protons and neutrons in an atomic nucleus is the mass number (A).

Step-by-step explanation:

The sum of protons and neutrons in an atomic nucleus is the mass number (A). The atomic number (Z) represents the number of protons in the nucleus, which is also equal to the number of electrons in a neutral atom. The difference between the mass number and the atomic number gives the number of neutrons.