chemistry

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Across
  1. 2. amount of electrons in hydrogen
  2. 5. atomic number 109
  3. 7. unit for mass
  4. 10. what group are called halogens
  5. 11. a single covalent bond
  6. 12. what orbits the nucleus in shells?
  7. 13. chemical reaction that produces heat
  8. 16. it has no charge
  9. 17. current largest source of renewable energy in the electricity sector
Down
  1. 1. two or more atoms chemically bonded together
  2. 3. what variable is the one you measure
  3. 4. speeds up a reaction
  4. 6. a mixture of two or more metals
  5. 8. the particles are more spread out
  6. 9. atomic number of 62
  7. 14. surname of discoverer of the nucleus
  8. 15. word meaning unreactive