chemistry vocab

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Across
  1. 3. any element in group 2 of the periodic table
  2. 5. any of the set of metallic elements in groups 4-12 of the periodic table
  3. 8. samples of a pure compound always contain the same elements
  4. 12. molecules composed only of two metals
  5. 17. a table of chemical elements arranged in order of atomic number
  6. 18. a positively charged elementary that is a fundamental constituent of all atomic nuclei
  7. 19. a positively charged ion
  8. 21. any of the gases in group O (18) of the periodic table
Down
  1. 1. any of the elements in group ia 1 of the periodic table
  2. 2. theory that matter consists of of invisible particles called atoms
  3. 4. the number of positive charges of protons in the nucleus of an atom of a given element
  4. 6. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons
  5. 7. an ionic species having a negative charge
  6. 9. a representation of a substance using symbols for its constituent elements
  7. 10. an element whose properties are intermediate between metals and solid non metals
  8. 11. any of two or more forms of a chemical element
  9. 13. an ionic bond is a chemical link between two atoms caused by an electrostatic force
  10. 14. the integer number nearest in value to the atomic weight of an atom and equal to the number of nucleons
  11. 15. an elementary particle that is a fundamental constituent of matter
  12. 16. element in group 17 of the periodic table
  13. 20. a fundamental group of atoms in a molecule serving as a base