Atoms

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Across
  1. 1. The center of an atom and contains most of its mass
  2. 2. It is one of three main particles that make up the atom with negative electrical charge
  3. 4. It is one of three main particles that make up the atom with positive electrical charge
  4. 5. The smallest part in matter
Down
  1. 1. It is one of three main particles that make up the atom with no electrical charge
  2. 3. The location of electrons in an atom