Atomic Theory Crossword

3. Studied atoms using gold foil and discovered that atoms have a dense positively charged nucleus and are mostly empty space.
5. A single particle of an element
8. Discovered neutrons.
9. Proposed the idea of “atomos” or particles that could not be cut.
10. An explanation or assumption used to explain an observation.
12. Particle with a positive charge.
13. Suggested 3D orbitals instead of rings around the nucleus where we have a high probability of finding electrons.
15. The lightest subatomic particle discovered by JJ Thomson.
17. Neutral particle that stabilizes the nucleus.
18. Name for the electrons in the outermost ring of a Bohr diagram.

1. Electrons in higher energy levels have _____ energy than electrons in lower levels.
2. Proposed the atomic theory where atoms are distinct from one another and combine to make compounds.
4. ______________ elements exist with two atoms stuck together.
6. Proposed the Plum Pudding model of the atom.
7. A way to communicate a theory or idea.
9. Proposed electrons act like waves which give them a fixed distance from the nucleus.
11. The number of rings in a Bohr diagram depends on the ________ where the element is found in the Periodic Table
14. Said we could not know the speed and location of an electron at the same time.
16. Suggested electrons orbit the nucleus in rings with fixed energy.