1.1 - 3.2

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Across
  1. 2. a particle with a negative charge
  2. 3. most of an atom's mass is found here
  3. 9. flexible covering that protects the inside of a cell
  4. 10. tells you the number of protons in the nucleus of an atom of that element
  5. 11. atoms of the same element that have the same number of protons, but a different number of neutrons
  6. 15. the smallest unit of elemental matter
  7. 18. an atomic particle that has a positive charge
  8. 19. a row on the periodic table
  9. 20. are ductile and conduct heat and electricity
Down
  1. 1. a chart of the elements
  2. 4. shows an element’s chemical symbol, atomic number, and atomic mass
  3. 5. an electrically neutral particle
  4. 6. the main ingredient in cells
  5. 7. have physical and chemical properties of both metals and nonmetals
  6. 8. use light energy to make glucose from water and carbon dioxide
  7. 12. stiff structure outside the cell membrane
  8. 13. a column on the periodic table
  9. 14. have no metallic properties
  10. 16. atoms of the same element that have the same number of protons, but a different number of electrons
  11. 17. make energy during cellular respiration
  12. 18. a molecule that has a positive end and a negative end