Periodic Table

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Across
  1. 1. number of protons+neutrons
  2. 3. seven chemical elements in group 18
  3. 5. substances that exist in a fluid state at standard temperature and pressure
  4. 6. a group of chemical elements that exhibit a mixture of physical and chemical properties
  5. 9. six chemical elements in group 2
  6. 10. disordered particles with no fixed shape or volume at standard temperature and pressure
Down
  1. 2. chemical elements in groups 3-12
  2. 4. number of protons=number of electrons
  3. 7. elements lithium, sodium, potassium, rubidium, cesium, and francium,
  4. 8. six highly reactive electronegative non-metals