Physics and Chemistry (Megan and Nisa)

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Across
  1. 3. - A family of elements with similar chemical properties
  2. 5. - an atom with negative charge
  3. 6. - an atom with positive charge
  4. 7. - A type of metal that reacts with other chemicals
  5. 9. Table - Elements can be found in it
  6. 12. - also known as H2O
  7. 13. - Reaction that releases energy by light or heat
  8. 15. - how many groups are there in the periodic table
  9. 17. - a liquid used to dissolve another substance
  10. 19. - an expression of chemical composition
Down
  1. 1. - chemical element of atomic number 7, a colorless, odorless gas
  2. 2. - Water and oxygen make this element
  3. 4. - The smallest particle of an element
  4. 8. - Reaction that releases cold
  5. 10. dioxide - also known as Co2
  6. 11. - materials which are considered essential to the support of biological life
  7. 14. - a series of elements
  8. 16. - simplest structural unit of a substance
  9. 18. - The purest of all
  10. 20. - also known as O2