Across
- 2. there shiny,malleable, ductile, and good conductors of thermal energy.
- 3. the most common element from Group 13, and is reactive.
- 6. gas at room temperature, and is 80% of the air you breath.
- 7. properties of both metal and nonmetals.
- 8. describes something that occurs or repeats at regular intervals.
- 9. the nonmetal carbon and and is necessary for living things on Earth.
- 11. particles of the nucleus that have no electric charge.
- 12. makes up 20% of air. needs substance to burn.
- 14. are less reactive than alkali metals are.
- 17. number is the sum of the protons and neutrons in an atom.
- 18. positively charged particles of the nucleus.
Down
- 1. gas unreactive nonmetals and part of group 18.
- 2. a Russian chemist, who discovered a pattern between the elements.
- 4. groups or 3-12, and does group 1 and group 2 metals.
- 5. an atom that has the same number of protons.
- 10. not malleable or ductile and brittle.
- 13. are very reactive, and contains nonmetal properties.
- 15. number the number if protons in the nucleus of an atom.
- 16. elements in Group 1 of the periodic table.