Across
- 4. an atom that has a positive electrical charge because it lost an electron
- 5. ability to gain an electron in a chemical bond
- 8. an atom that has a negative electrical charge because it gained an electron
- 9. a molecular geometry with four surrounding atoms
- 10. all atoms must have 8 valence electrons in order to be stable
- 11. this equals the number of protons
- 12. an atom that has an electrical charge
- 13. a compound containing a metal and a nonmetal
Down
- 1. group of atoms that are covalently bonded with an overall charge
- 2. energy needed to lose an electron
- 3. this equals the sum of protons and neutrons
- 6. a compound containing two nonmetals
- 7. a unit used by chemists to simplify big quantities
- 8. a weighted average of all naturally occurring isotopes