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ch.4atomicstructure
chemistry atomic structure, electron configuration
| Question | Answer |
|---|---|
| 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 |
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