ME 2733 Chapter : Materials Notes Ch 2
Document Summary
Time scale: electron, 1. 6x10-19c, 9. 11x10-31kg, millisecond (camera flash, microsecond (5 microseconds is for light to travel 1 mile, nanosecond (1 ghz, picosecond (switch time for world"s fastest transistor) 2. 1 fundamental concepts: nucleus: protons and neutrons 1. 67x10-27kg, avogadro"s number: 6. 022x1023. 2. 2 atomic model: rutherford atomic model 1909, atomic mass unit: 1/12 c12 = 1. 66x10-27kg, atomic number (z): proton , n: neutron , atomic mass: a ~ z+n. Quantum mechanics: wave mechanics, schrodinger equation, matrix mechanics, path integral. Quantum numbers: (n, l, m) l: second ---------- (angular momentum: n: principal quantum number, ml: magnetic, = 0, +/- 1, +/- 2 +/- l, ms: spin momentum. Electron configuration: fermiens: quarks/ neutrons/ e-/ protons, half-integer spin, bossons: photons/ gluon/ higgs, integer spin orbital before pairing. Hund"s rule: when a p, d, f subshell has been filled one electron will occupy each in orbital"s of higher energy levels until all electrons are distributed. Pauli exclusion principle: no two electrons have the same four quantum numbers.
