Atoms

Atoms

1. number of protons decides which element it is

2. smallest part of an atom with all the properties

3. charges

   • proton +
   • neutron
   • electron -
   • no overall charge

4. protons and neutrons in nucleus

5. electrons in orbit

6. lots of empty space

7. nucleus is tiny, but massive(density)

8. atomic number = number of protons = number of electrons

9. mass number = protons +neutrons

10. arranged in shells

    • fills from lowest first
    • 1=2, 2=8, 3=8 BUT...18, 4=8