atomic theory

3. atomic mass " the weighted average mass of all naturally occuring isotopes of the element
4. anything that has mass,and takes up space
6. the center core of the atom containing protons and neutrons
7. particals that carry a positive charge
8. atoms with the same number of protons and different numbers of neatrons
9. smaller particales that protons and neutrons are made of
10. number: the numbers of protons that an element contains
11. number: the sum of protons and the number of neutrons in the neuclus of an atom

1. cloud: the area around the neclues where electrons are most likely to be found
2. shells: outer rings of atom that contain electrons. these chells orbit around the nuclues.
3. the smallest piece of an element that still holds the propites of the element
5. particales that carry negitive charge
10. atmoic mass unit used to measure the mass of atom