Atomic Theory

2. A neutrally charged subatomic particle
5. The number of protons in the nucleus of an atom
6. An atom or molecule with a net electric charge due to the loss or gain of electrons
7. The weighted average mass of the atoms in a naturally occurring sample of the element
8. Atoms with the same number of protons but different numbers of neutrons
10. The basic unit of a chemical element
11. the total number of protons and neutrons in a nucleus
12. The area around an atom's nucleus where electrons are most likely to be found
13. A pure chemical compound is always made up of the same elements combined together in a tied (or definite) proportions of mass

1. The central most important part of something
3. The amount of matter stays the same, even when matter changes form
4. When two elements form more than one compound the ratios of the masses of the second element that combine with the first element will always be ratios of small whole numbers
9. A positively charged subatomic particle
14. A Negatively charged subatomic particle