Matter

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Across
  1. 2. Anything that has volume and mass
  2. 4. An atom that gains or loses one or more electrons from its outermost energy level.
  3. 6. A tiny particle with the same mass as a proton but has no electrical charge.
  4. 8. A substance that cannot be broken down into smaller substances.
  5. 9. The sum of the protons and neutrons in an atom nucleus.
  6. 10. Has little mass
Down
  1. 1. A tiny particle that has mass and a positive electrical charge.
  2. 3. Atoms of the same element but different mass numbers.
  3. 5. The center of an atom
  4. 7. The number of protons in an atom nucleus.