crossword puzzle by Kendreya WIlliams

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Across
  1. 2. is a chemical substance composed of many identical molecules.
  2. 4. its mass per unit volume.
  3. 6. cloud model which shows electrons traveling in specific energy levels around a nucleus.
  4. 8. is made up of a nucleus, protons and electrons.
  5. 9. made up of atoms with same identity.
  6. 12. negative charged particles in the nucleus.
  7. 13. a definite volume but no definite shape.
  8. 14. the particles vibrate in place.
  9. 17. number The number of protons in the atom.
Down
  1. 1. a group of atoms bonded together,
  2. 3. Positive charged particles in the nucleus.
  3. 5. Hold protons, electrons, and neutrons.
  4. 7. Neutral particles in the atom.
  5. 8. mass composed mostly of protons and neutrons in the nucleus.
  6. 10. a property of a physical body and a measure of its resistance to acceleration
  7. 11. table a table of the chemical elements arranged in order of atomic number, usually in rows
  8. 15. no definite volume and no definite shape.
  9. 16. hows that the electrons in atoms are in orbits of differing energy around the nucleus. Mendeleev Created the periodic table.