Atomic structure

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Across
  1. 4. State where electrons “jump” to a higher energy level
  2. 5. Elements with the same number of protons and different number of neutrons are ____
  3. 13. State where electrons fill the lowest energy levels
  4. 14. Orbitals can hold a maximum of ___ electrons
  5. 15. Atoms are _____ when they are in an excited state
  6. 16. The sum of the protons and neutrons determines the ____ number
  7. 19. Region around the nucleus where electrons are most likely to be found
  8. 20. Subatomic particle with no charge
  9. 21. Negatively charged particle that orbits the nucleus
Down
  1. 1. The ____ of an atom is hard and dense
  2. 2. _____ electrons are located in the outermost energy level
  3. 3. An atom is made up of mostly ____ space
  4. 6. The number of ____ determines the element
  5. 7. When electrons in an excited state return to lower energy levels, they emit energy in the form of _____
  6. 8. Electrons further from the nucleus contain ___ energy
  7. 9. Electrons want to be ____ as long as possible
  8. 10. Fundamental building block of matter
  9. 11. Charge of a nucleus
  10. 12. An atom is ___ if the number of protons equals the number of electrons
  11. 17. Electrons ______ energy when they move to a higher energy level
  12. 18. _____ number is determined by the amount of protons in an atom