Atomic number is the number of proton
- Atomic number is the number of protons and electrons
- Atomic number is protons
- Is atomic number protons or neutrons
- Atomic number is the number of protons in an atom
- Atomic number is the number of protons and electrons true or false
- Atomic number is the number of protons true or false
- Atomic number is the same number of protons
- The atomic number is the number of protons in a nucleus
- Is the atomic number equal to the number of protons
- Is proton number equal to atomic number
- Atomic number equals the number of protons or
- Atomic number equals the number of protons or electrons
- The atomic mass number is the number of protons
- Atomic number is the number of protons in the nucleus of an atom
- Atomic number protons electrons and neutrons