Across
- 3. Anything that has mass and takes up space
- 4. the smallest unit of matter (what all matter is made out of)
- 5. model of the atom in which electrons move rapidly around the nucleus in paths called orbits; planetary model
- 7. subatomic particles in the nucleus of an atom that have no charge, and so only contribute to the mass of an atom (mass: 1, charge: 0)
- 11. Electrical property (characteristic). Opposite charges attract, and like charges repel.
- 12. Discovered the electron using the cathode ray tube and developed the Plum Pudding Model of the atom.
- 13. positively charged subatomic particles in the nucleus of an atom (mass: 1, charge: +1)
- 14. A measure of how much matter is in an object
- 15. the center of an atom; made up of protons and neutrons
Down
- 1. Developed the atomic theory of matter: 1) All matter is made of atoms. Atoms are indivisible and indestructible. 2) All atoms of a given element are identical in mass and properties 3) Compounds are formed by a combination of two or more different kinds of atoms. 4) A chemical reaction is a rearrangement of atoms.
- 2. Conducted by Ernest Rutherford in which alpha particles that were shot at gold foil were deflected when they hit the positive center of gold atoms. The nucleus was discovered as a result of this experiment.
- 6. Greek philosopher that said all matter is made of tiny particles called "atomos" or atoms
- 8. smaller than an atom
- 9. negatively charged subatomic particles that surround the nucleus of an atom (mass: 0, charge: -1)
- 10. scientist who did the gold foil experiment and discovered the nucleus