Matter

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Across
  1. 3. The center of an atom. Made up of protons and neutronstrons.
  2. 4. Anything with volume and mass.
  3. 6. The number of protons in an atom’s nucleus. (Two words)
  4. 8. The basic unit of a chemical element with a nucleus made of protons and neutrons.
  5. 10. A small particle with no electric charge.
  6. 11. Atoms of the same element that have different mass numbers.
Down
  1. 1. An atom with a net charge due to losing one or more electrons from its outermost energy level.
  2. 2. Has little mass and a negative electric charge.
  3. 5. A small particle with a positive electric charge.
  4. 7. The number of protons and neutrons in an atom’s nucleus. (Two words)
  5. 9. A substance that cannot physically or chemically be broken down any further.