Atomic Theory Crossword

Edit Answers
123456789101112131415161718
Across
  1. 3. An ion with a negative charge.
  2. 4. The scientific theory stating that all matter is composed of tiny, discrete units called atoms
  3. 5. Discovered the electron using the cathode ray tube
  4. 6. Discovered the neutron
  5. 8. A subatomic particle in the nucleus with a positive charge
  6. 9. Proposed the quantum mechanical model of the atom
  7. 11. An ion with a positive charge.
  8. 12. A subatomic particle with no charge
  9. 14. Gold foil experiment
  10. 17. The total number of protons and neutrons in an atom's nucleus.
  11. 18. Explained hydrogen’s emission spectrum
Down
  1. 1. An atom or molecule that has gained or lost electrons, resulting in a net positive or negative charge
  2. 2. Atoms are indivisible, identical within an element, and combine in whole-number ratios
  3. 3. The number of protons in an atom's nucleus, defining the element.
  4. 7. Basic unit of an element
  5. 10. Greek philosopher who proposed that matter is made of invisible particles called atoms
  6. 12. The dense, central part of an atom
  7. 13. Formulated the uncertainty principle
  8. 15. A subatomic particle with a negative charge, found around the nucleus
  9. 16. Atoms of the same element that have the same number of protons but different numbers of neutrons.