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chemistry atomic structure, electron configuration

Electrons (e-) *negatively charge *discovered by J.J Thomson *mass of 1/1840 atomic mass unit (amu)
Protrons (p+) *positively charged particles *discovered by Goldstein *mass of 1 atomic mass unit (amu)
Neutrons (n0) *have no charge *discovered by James Chadwick *mass of 1 atomic mass unit (amu)
Isotopes Are atoms of the same element. They have the same # of protons but different #'s of neutrons
John Dalton considered the atom ad a solid indivisible mass
J.J Thompson proposed the plum-pudding model
Ernest Rutherford proposed the nuclear atom
Niels Bohr proposed the planetary model
Erwin Schrodinger proposed the quantum mechanical model
Aufbau Principle electrons enter orbits of lowest energy first
Pauli Exchsion Principle *an orbital can hold 2 electrons *the electrons must have opposite spins
Hund's Rule when electrons occupy orbitals of equal energy one electron occupies each orbital until all the orbitals contain one electron
How do u get the D block in electron configuration? the D block is always one less then S,P *ex-26---1s2 2s2 2p6 3p2 3p6 4s2 3d6
How do u get the F block in electron configuration? *u go through La on 58,71 *just add La to 59-70 *ex- 58---6s2 5d1 4f1 *ex- 59---6s2 4f3
What r the 2 exceptions in electron configuration? chromium and copper
Created by: 1431609046