The mass number of an atom is equal to the sum of
- The mass number of an atom is equal to the sum of its protons and electrons
- The mass number of an atom is equal to the sum of protons and neutrons in the nucleus
- The mass number of an atom is equal to the sum of its protons and electrons true false
- The mass number of an atom is equal to the sum of the number of its blank and blank
- Chemistry atomic mass number
- How to find atomic number
- The mass number of an atom can be calculated from