- Development of the atom

•  Dalton's theory

• J.J Thompson's theory and cathode ray experiment

• Rutherford's Gold Foil experiment and conclusions

• The Bohr Mode of the atom

• The wave mechanical model of the atom

-Protons, neutrons, and electrons

-nucleus of an atom

- atomic number, mass number, nuclear charge

- ions and their charges

- isotopes (definition)

- calculating average atomic mass of an element using relative percent abundances

- Bohr's model of the atom in regards to:

• location of electrons in energy levels

• excited state and ground state electrons

• bright line spectra

-Valence electrons 

-Electron configurations