Across
- 3. Has 76 protons
- 6. Chemical formula is H20
- 7. Has 2 naturally occurring isotopes
- 9. Vertical row of elements
- 10. The positively charged center of the atom
- 12. The___number is the sum of the protons and neutrons
- 14. Nonmetal, lightest and Simplest element
- 15. Also known as NaCI
- 16. Has 108 protons
- 19. Used as a disinfectant
- 20. Symbol is O
Down
- 1. The ____ number determines the type of element
- 2. Atoms of the same element,different#of neutrons
- 4. Used for machinery and tools
- 5. Electron __ is an area around the nucleus of an atom where electrons are most likely to be found
- 8. Has an atomic number of 35
- 11. Used in batteries
- 13. It's symbol is K
- 17. Particles in the nucleus with a positive charge
- 18. Horizontal row of elements