1. protons plus neutrons
  2. proton number
  3. neutral charge
  4. positive charge
  5. smallest particle to retain characteristics
  6. negative charge


atomic mass

atom

electron

proton

neutron

Verified Answer :

1 protons plus neutrons  ~Atomic mass

2 proton number ( Atomic number )

3 neutral charge ~Neutron

4 positive charge ~proton

5 smallest particle to retain characteristics  ~atom

6 negative charge ~electron