Across
- 2. what holds you to the planet
- 4. a row in the periodic table
- 5. a positive or negative element/atom
- 7. have a pH greater than 7
- 8. where all elements are found
- 9. an element with more neutrons than normal
- 13. is the number of protons for the element
- 16. used to measure acids and bases
Down
- 1. a column on the periodic table
- 3. pH of 7
- 6. elements who do not react with others
- 10. atoms want to have 8 valence electrons
- 11. protons plus neutrons
- 12. time needed for half of the isotope to decay
- 14. 2 or more different elements bonded together
- 15. have a pH less than 7