Atomic Theory

3. Negative subatomic particle
4. The mass of an atom
6. Believed that matter could only be divided to a certain point
10. Positive subatomic particle
12. States that matter could only be divided to a certain point
14. A distinct substance that is composed of the atoms of two or more elements that is always consistent
15. The positively charged center of the atom consisting of protons and neutrons
16. The total number of protons and neutrons in an atomic nucleus
17. Conducted the cathode ray experiment that verified the electron

1. The modern concept of the atom
2. States that given compound always has the same proportions of elements by mass
5. Believed that the atom was a solid sphere
7. States that matter could be broken down forever and ever
8. A model of the atom it is a sphere of positive charge, with negatively charged electrons in it
9. Realized that elements like air could be broken down
11. Conducted the gold-foil experiment
13. Neutral subatomic particle