states of matter

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Across
  1. 2. number is the sum of protons & neutrons in the nucleus of an element
  2. 6. is any member of a large class of gaseous, liquid, or solid chemical compounds whose molecules contain carbon.
  3. 8. is a material system made up of two or more different substances which are mixed but are not combined chemically.
  4. 10. is a pure chemical substance consisting of a single type of atom distinguished by its atomic number, which is the number of protons in its atomic nucleus.
  5. 12. hand side above is mass number
  6. 15. are made when 2 or more atoms join together
  7. 16. number is no. of protons present in the nucleus of an element
  8. 17. in nature is atom
  9. 19. is the symbol of iron
Down
  1. 1. molecules are very loosely packed
  2. 3. of cobalt is co
  3. 4. is the old Latin name of copper
  4. 5. is uniform in composition
  5. 7. are positive
  6. 9. are negative
  7. 11. molecules are loosely packed
  8. 13. is the symbol of helium
  9. 14. molecules are tightly packed
  10. 16. is neutral in nature
  11. 18. A is represented as mass number