Summary

Atoms have a small positive nucleus made of protons and neutrons and are usually surrounded by electrons.
Nuclear notation: ^A_ZX, Z protons A mass X atomic symbol
Ion is atom with net charge.
In Bohr model, Coulomb force between nucleus and electrons provides centripetal force for circular orbit: F_e=k\frac{q_1q_2}{r^2} supplies F_{net}=m\frac{v^2}{r}
Circumference must equal a whole number of de Broglies wavelength: n\lambda=2\pi r
Atomic structure here is only defined as energy levels, no probability functions yet.