science vocab

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Across
  1. 2. The center of an atom
  2. 3. Number of protons/number of electrons in the atom
  3. 4. a substance made of just one type of atom which cannot be broken down or changed into another substance.
  4. 7. Number of protons + neutrons found in the nucleus
  5. 10. Negatively charged particles found in the electron shells AROUND the nucleus
  6. 11. A visual representation of all elements found/made on Earth developed by Dmitri Mendeleev
  7. 12. letter/s that represent an atom on the Periodic Table
Down
  1. 1. Neutral charged particle found in the nucleus
  2. 3. The name of the element found on the Periodic Table
  3. 5. Charged particles in the last/outermost shell. This allows for atoms to combine to form molecules.
  4. 6. Atoms in combination
  5. 8. Positively charged particle found in the nucleus
  6. 9. Smallest whole unit of matter