Vocabulary Walk #2

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Across
  1. 2. Atomic ___________ the number of protons an atom has, determines an atom's identity.
  2. 4. Electron ________ negatively charged space outside the nucleus that holds the electrons.
  3. 5. The total number of protons and neutrons in an atom.
  4. 6. A horizontal column on the periodic table.
Down
  1. 1. A vertical column on the periodic table.
  2. 3. The tendency of a substance to undergo chemical changes.
  3. 5. Atomic _____ the average mass number of atoms of an element.