The Atom

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Across
  1. 3. has no charge but has a mass of 1 amu
  2. 6. smallest unit of matter
  3. 7. protons plus neutrons
  4. 9. science that studies matter and its interactions
  5. 10. atomic mass unit
  6. 13. In the Bohr model, electrons are placed on......
  7. 14. element with 28 protons
  8. 15. same as the number of protons
  9. 17. always the same number as the protons in a neutral atom
  10. 19. evidence that comes from inferences because data can't be seen
  11. 20. simple diagram that show the atom's structure
  12. 21. a substance that can't be broken down by chemical reactions
Down
  1. 1. anything that has mass and takes up space
  2. 2. identifies the element
  3. 4. force that holds an atom together because opposites attract
  4. 5. same element but different number of neutrons
  5. 7. the amount of matter in something
  6. 8. space surrounding the nucleus where electrons are found
  7. 11. where all the mass of the atom is
  8. 12. the amount of space something take up
  9. 16. 2 or more atoms bonded together
  10. 18. weighted average of all the different isotopes of an element