Across
- 2. consisting of protons and neutrons and containing nearly all its mass.
- 5. positively charged particle of matter found in the atoms of all elements.
- 8. has a neutral charge
- 10. protons + neutrons
- 12. has 2 valence electrons but grouped with elements with 8
- 14. when an atom is most stable it has 8 valence electrons
- 15. A small particle with a negative charge
- 17. equal amount of electrons and protons
- 18. more protons than electrons
- 19. level closest to the nucleus
Down
- 1. 2 forms of the same element same protons
- 3. table where elements are put in a table
- 4. Number of protons
- 6. molecule with net charge
- 7. basic unit of a chemical element
- 9. electrons on the outer most level
- 11. 1 on the periodic table
- 13. chemical symbol representing the nucleus and all internal electrons
- 16. more electrons than protons