Chemistry Chapter 4 Vocab

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Across
  1. 3. positive particles in the nucleus.
  2. 5. all matter is made of this
  3. 6. the sum of the neutrons and protons in an atom
  4. 7. his model is known as the plum pudding model
  5. 8. subatomic particle that has a negative charge
Down
  1. 1. discovered that alpha particles are positively charged ions
  2. 2. the weighted average of all the masses of an element’s isotopes
  3. 4. the number of protons in an atom