Across
- 3. same number of valence electrons
- 7. opposite of proton
- 8. opposite of electron
- 11. this number is
- 12. mark, sign, or word that indicates something chemistry identifies substances matter is composed similar alike
- 13. hard, shiny, malleable, fusible,
- 14. neutral atom
- 15. substance that expands freely
- 16. " ******** table"
- 17. how heavy
Down
- 1. elements with similar properties
- 2. determines the number of atoms combined
- 4. smallest unit of matter
- 5. same number of electron shells
- 6. between those of metals and nonmetals
- 9. showing high moral principles and ideals.
- 10. a pure substance consisting of atoms
- 14. an element or substance that is not a metal.