Chemistry of Chemistry

1234567891011121314
Across
  1. 1. unit mass of a proton or a neutron
  2. 3. radiation that is in the form of energy
  3. 6. smallest unit of matter
  4. 7. the atomic number of Na
  5. 9. rows in the periodic table
  6. 10. electrons orbit the nucleus in a cloud or .........
  7. 12. group 18 of the Periodic Table are the ....... gases
  8. 13. the number of electrons in the outermost shell of an atom
Down
  1. 1. radiation that is given off as a helium nuclei
  2. 2. when group I metals react in water they make this
  3. 3. chemical family organised in columns
  4. 4. Russian who developed the periodic table
  5. 5. to calculate the atomic .......... add the number of neutrons and protons
  6. 8. the number of neutrons in carbon
  7. 11. form of an element with different atomic weights
  8. 14. to get the atomic weight do this to the number of protons and neutrons