Chemistry crossword puzzle

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Across
  1. 3. ______metals any of the six chemical elements that make up Group 1 (Ia) of the periodic table
  2. 8. there are ____ blocks on the periodic table
  3. 9. is a group of highly reactive nonmetal elements in group 17 of the periodic table
  4. 11. there are ___________ groups in the periodic table
  5. 12. ____metals metallic elements that serve as a bridge, or transition, between the two sides of the periodic table.
  6. 14. the basic unit of matter and the smallest particle that retains the chemical properties of an element.
  7. 15. chemical element, often lustrous, hard, and malleable, that is a good conductor of heat and electricity.
  8. 16. is the amount of space a three-dimensional object occupies
  9. 19. a subatomic particle that has a negative charge
  10. 20. is a silver-white soft waxy ductile element of the alkali metal group with atomic number 11 that
Down
  1. 1. a chemical element; it has symbol C and atomic number 6.
  2. 2. equals the mass of the substance divided by its volume
  3. 4. __________number 6.023 X 1023
  4. 5. is a unit of measurement that is the amount of a pure substance containing the same number of chemical units
  5. 6. is the process by which an unstable atomic nucleus loses energy by radiation
  6. 7. are substance with a defined chemical composition, meaning it's always made up of the same components.
  7. 10. is a branch of natural science that deals principally with the properties of substances, the changes they undergo, and the natural laws that describe these changes.
  8. 13. there are ______ periods in the periodic table
  9. 17. a naturally occurring metal found in the earth's crust and can be toxic to humans and animals.
  10. 18. Gases are a group of elements in Group 18 of the periodic table