homework crossword

2. Early atomic model describing electrons embedded in a positively charged sphere
4. Scientist who refined the planetary model to include quantized electron orbits
6. Scientist who performed the gold foil experiment and developed the nuclear model of the atom
9. Principle stating that when two elements form different compounds, the ratio of the masses of the second element that combine with a fixed mass of the first element can be expressed as small whole numbers
13. Scientist known for his early work on atomic theory and his proposal of the law of multiple proportions
14. Ancient Greek philosopher who first proposed the concept of the atom
15. Physicist who discovered the electron and proposed the Plum Pudding Model

1. Concept proposed by Aristotle stating that matter consists of earth, water, air, and fire
3. Law stating that a chemical compound always contains the same elements in the same proportion by mass
5. Current scientific model that describes electrons as existing in a "cloud" around the nucleus
7. Early theory suggesting that matter is composed of indivisible units
8. Theory proposing that all matter is made up of atoms that are indivisible and indestructible
10. Model of the atom proposing electrons orbit the nucleus at fixed distances
11. Model describing electron probability distributions rather than fixed orbits
12. Greek philosopher who theorized about four fundamental elements