Across
- 4. these are made of bonded atoms
- 7. atoms of the same element that have different numbers of neutrons
- 8. the outer shell electrons that are used for chemical bonds
- 12. the molecules that are created after a chemical reaction
- 13. a negatively charged subatomic particle
- 14. a subatomic particle with no charge
- 15. a building block of every substance
- 16. the sum of protons and neutrons in an atom
- 17. positively charged subatomic particle
Down
- 1. arranged horizontally these signify atoms that add electrons to the same shell
- 2. consists of the protons and neutrons in an atom
- 3. the number of protons in an atom
- 5. the description of a chemical reaction
- 6. the molecules that are combined to create a chemical reaction
- 9. atoms that have the same number of protons
- 10. an atom that has gained or lost at least one electron
- 11. arranged vertically these atoms have similar properties