Atoms

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Across
  1. 4. This is the lightest element on the periodic table.
  2. 5. The center of an atom.
  3. 6. ________ are negative and live outside of the nucleus.
  4. 7. ______(2 words, no space between)is the number that tells how many protons and how many electrons an element has.
Down
  1. 1. The ________ table lists all of the elements (atoms).
  2. 2. _________ have a positive charge and live in the
  3. 3. ______ are neutral and live in the nucleus.
  4. 8. The atomic _____ gives the number of protons and neutrons.