Ethan Simpkins- Atoms Crossword Puzzle

123456789101112131415161718
Across
  1. 4. cloud the system of electrons surrounding the nucleus of an atom.
  2. 5. the amount of matter in an object.
  3. 7. positive charge
  4. 9. Atomic (?) model
  5. 10. water.
  6. 11. arranges elements.
  7. 13. equal to protons
  8. 16. p=m/v
  9. 17. (?)-atomic number=neutrons
  10. 18. created the periodic table
Down
  1. 1. an electrically neutral group of two or more atoms held together by chemical bonds.
  2. 2. negative charge
  3. 3. chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds.
  4. 6. rock.
  5. 8. neutral charge
  6. 12. nitrogen.
  7. 14. protons and neutrons are inside where?
  8. 15. water vapor.
  9. 17. Basic building block of life