Chemistry, The Periodic Table, and Other Science Terms

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Across
  1. 1. Building blocks of protons and neutrons with an electric charge
  2. 3. Solid, gas, plasma, and ___
  3. 5. A positively charged subatomic particle
  4. 6. Chemical element with symbol Xe and atomic number 54
  5. 9. SI unit of energy
  6. 11. The fixed path on which an electron moves or revolves around the atom's nucleus
  7. 12. An atom of the same element, having the same atomic number but different mass number
  8. 14. ___ metals, Group 1 (Ia) on the periodic table
  9. 15. Substance made up of multiple chemically bonded elements
  10. 17. Starting material(s) in a chemical reaction
  11. 18. Study of chemical processes related to living things
Down
  1. 2. SI unit of temperature
  2. 4. elements that have properties of both metals and nonmetals
  3. 7. ___ gas, an inert gas such as helium, argon, and radon
  4. 8. Chemical element that makes up 78% of air
  5. 10. Movement of solvent molecules across a semipermeable membrane
  6. 13. ___ electrons, which are the electrons on the outside of the atom.
  7. 16. Process of which plants synthesize foods, with a chemical equation of 6CO2+6H2O→C6H12O6+6O2