atomic theory

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Across
  1. 3. the sum of protons and neutrons in the nucleus of an atom
  2. 6. a small positively charged particle that is found in the nucleus of an atom
  3. 7. an idea that has been studied and investigated and is supported by a vast and diverse array of evidence
  4. 8. a small particle in the nucleus of the atom with no electrical charge
  5. 9. an atom with the same number of protons and a different number of neutrons from other atoms of the same element
Down
  1. 1. a tiny negatively-charged particle that moves around the outside of the nucleus
  2. 2. the central core of an atom which contains proton and neutrons
  3. 4. the basic particle from which all elements are made, has the propertied of the element
  4. 5. the number of protons in the nucleus of an atom