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Bohr Models – Selected Ans
Unit 2 – Lecture 4
Background Information
Describing Orbitalse-s exist in shells surrounding the nucleus
Lewis dot structures – show valence shell of e-s onlycan be used to show bonding
Describing Orbitals – cont’dBohr Models – show basically same info but
includes also the other levels used to figure out valence e-
further knowledge has shown that e-s actually move in a cloud, taking up more than just ringsmodel to the right is about
70 years out of date!!
Quantum Numbers
Quantum Numbers – cont’d
***the 4***the 4thth level “s” level “s”
fills fills before before the 3the 3rdrd
“d” “d” level!!!!!level!!!!!
Quantum #s ExamplesHydrogen –
# of e-s = [recall: atoms are neutral] = 1e-s determine shellswill only fill part of the first “s” orbitalwe note this as “ 1s1 ”
meaning 1st s orbital w/ 1 e-
Quantum #s ExamplesPhosphorous –
# of e-s = [recall: atoms are neutral] = 15e-s determine shells15 e-s; fill from bottom upnotation:
1s2 2s2 2p6 3s2 3p3
Quantum #s ExamplesManganese –
# of e-s = [recall: atoms are neutral] = 25e-s determine shells25 e-s; fill from bottom upnotation:
1s2 2s2 2p6 3s2 3p6 4s2 3d5
Quantum #s & Periodic TablePeriod Indicates Quantum Numbers!!!
Just count across the periods…
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