MCAT Review Sheets.pdf - Google Drive
Photon emitted when n ̄, absorbed when n- Heisenberg Uncertainty: It is impossible to know the momentum and position simultaneously. Hund’s Rule: e- only double up in orbitals if all orbitals first have 1 e- . Pauli Exclusion Principle: Paired e- must be + " # , − " # . Scientist Contributions AHED Mnemonic Absorb light Higher potential Excited Distant from nucleus A X A = Mass number = protons + neutrons Z Z = Atomic number = # of protons Note: Atomic Weight = weighted average Constants Light Energy E = ( ) l E = h f f = frequency h = Planck8 s constant c = speed of light Diamagnetic: ̄ All electrons are paired REPELLED by an external magnetic field Paramagnetic: 1 or more unpaired electrons PULLED into an external magnetic field Follow Hund’s rule to build the atom’s electron configuration. If 1 or more orbitals have just a single electron, the atom is paramagnetic. If there are no unpaired electrons, then the atom is diamagnetic. Examples: He = 1s2 = diamagnetic and will repel m