Across
- 5. neutral particle
- 6. The number of protons in an atom
- 7. e-
- 8. Atoms of the same element with a different number of neutrons
- 9. Dot made the Dot model for valence electrons
- 11. Bohr model of atom
- 13. element organizer
- 14. The horizontal row on the periodic table
Down
- 1. The average mass of an atom of an element
- 2. outermost electron
- 3. basic building block of matter
- 4. p+
- 10. charged atom
- 12. The vertical column the periodic table
- 15. the things that hold the electrons within an atom