Across
- 3. isotopes that are unstable
- 4. Indicates the number of protons/electrons
- 7. In the nucleus;no electrical charge;mass of 1
- 9. Make up protons and neutrons
- 12. Substance that is entirely one type of atom
- 13. Vertical columns of the periodic table
- 15. Lighter nuclei combine to form heavier nucleus
- 16. Horizontal rows of the periodic table
- 17. Large nucleus splits into smaller pieces
Down
- 1. When there is a difference in neutrons
- 2. Properties of metals and nonmetals
- 5. Brittle, dull, poor conductors
- 6. Indicates the number of protons+neutrons
- 8. Time required for 1/2 of the atoms to
- 10. Outside the nucleus;negative charge; no mass
- 11. Smallest unit of an element that has elemental properties
- 14. In the nucleus;has a positive charge;mass of 1