Across
- 2. a chemical that starts or speeds up a reaction
- 6. turn blue litmus paper red and taste sour
- 7. a reaction that gives off energy
- 8. are full often brittle and do not conduct heat or electricity
- 12. a negatively charged particle in the atom
- 13. the smallest unit of an element
- 16. A bond where atoms lend or borrow electrons
- 17. the first person to come up with a periodic table
- 18. Has neutral pH
- 20. share attributes of both metals and non metals
- 21. are shiny and conduct heat and electricity
Down
- 1. the number of protons
- 2. the study of how elements and their combinations
- 3. used to determine whether a substance is an acid or a base
- 4. a base used to wash your hands
- 5. a citrus fruit that is an example of an acid
- 9. turn red litmus paper blue and taste bitter
- 10. the neutral particle in an atom
- 11. a reaction that requires energy
- 14. these elements rarely react with others
- 15. The positively charged particle in the nucleus of an atom
- 19. a bond where atoms share electrons