2026-09-14 10:43:03: Viruses 2

2026-09-14 10:43:04 -04:00
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+[[Modern Physics]]
+# 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.