Across
- 2. rounded atomic mass number that represents the number of protons & neutrons in an atom’s nucleus
- 4. a model of the atom that shows the valence electrons and their arrangement
- 8. subatomic particle that weighs 0 AMU
- 9. subatomic particle that has a neutral charge
- 10. on the periodic cell and represents the number of protons for that element
Down
- 1. the number of electrons in the outermost shell of the electron cloud
- 3. a model of the atom that shows the arrangement of electrons in layers
- 5. on the periodic cell and represents an abbreviation of the element's name
- 6. subatomic particle that determines the element
- 7. on the periodic cell and represents the weighted average of naturally occurring isotopes
- 11. different layers of electrons are found in