Across
- 2. electrons An electron that is found is found in the outermost shell of an atom.
- 7. The SI unit used to measure the amount of a substance
- 8. A region in an atom where there is a high probability of finding electrons
- 9. A subatomic particle that has a negative charge
- 11. A subatomic particle that has no charge and that is located in the nucleus of an atom
Down
- 1. An atom that has the same number of protons or the same atomic number
- 3. An atoms central region, witch is mad up of protons and neutrons
- 4. A unit or Quantum of light
- 5. A subatomic particle that has a positive charge and that is located in the nucleus of an atom
- 6. number The number of protons in the nucleus of an atom.
- 7. number The sum of the numbers of protons and neutrons in the nucleus of an atom
- 10. atomic mass unit A unit of mass that describes the mass of an atom or molecule