Across
- 3. sum of all the protons and neutrons in an atom
- 6. electrons in the outermost energy level of an atom
- 8. This family is unreactive
- 11. Same amount of subatomic particles except for neutrons
- 12. number of protons in an atom
- 14. These are located in the left side of the periodic table
- 15. A negatively charged ion
- 16. Atom that gained or lost electrons
Down
- 1. These are located in the right side of the periodic table
- 2. Subatomic particles that are negative
- 4. A positively charged ion
- 5. These are located in at the staircase on the periodic table
- 7. Subatomic particles that is neutral
- 9. the simplest form of a pure substance
- 10. Subatomic particles that are positive
- 13. Center part of an atom containing subatomic particles