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Bohr Models – Selected Ans Sodium [11] p + s = 11 e - s = 11 1 st ring = 2 e - s 2 nd ring = 8 e - s 3 rd ring = 1 e - s Carbon [6] p + s = 6 e - s = 6.

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Presentation on theme: "Bohr Models – Selected Ans Sodium [11] p + s = 11 e - s = 11 1 st ring = 2 e - s 2 nd ring = 8 e - s 3 rd ring = 1 e - s Carbon [6] p + s = 6 e - s = 6."— Presentation transcript:

1 Bohr Models – Selected Ans Sodium [11] p + s = 11 e - s = 11 1 st ring = 2 e - s 2 nd ring = 8 e - s 3 rd ring = 1 e - s Carbon [6] p + s = 6 e - s = 6 1 st ring = 2 e - s 2 nd ring = 4 e - s Chlorine [17] p + s = 17 e - s = 17 1 st ring = 2 e - s 2 nd ring = 8 e - s 3 rd ring = 7 e - s

2 Unit 2 – Lecture 4

3 Background Information Groups = vertical columns Periods = horizontal rows

4 Describing Orbitals e - s exist in shells surrounding the nucleus Lewis dot structures – show valence shell of e - s only can be used to show bonding

5 Describing Orbitals – contd Bohr 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has shown that e - s actually move in a cloud, taking up more than just rings model to the right is about 70 years out of date!!

6 Quantum Numbers Quantum #s – describe the clouds of e - s First E Level = s up to 2 e - s Second E Level = p up to 6 e - s Third E Level = d up to 10 e - s …thats as high as were going to go

7 Quantum Numbers – contd Levels fill from lowest (s) to highest (d-for our purposes…) 1s(up to 2) 2s(up to 2) 2p(up to 6) 3s(up to 2) 3p(up to 6) 4s(up to 2) 4s(up to 2) 3d(up to 10) 4p(up to 6) 4p(up to 6) ***the 4 th level s fills before the 3 rd d level!!!!!

8 Quantum #s Examples Hydrogen – # of e - s = [recall: atoms are neutral] = 1 e - s determine shells will only fill part of the first s orbital we note this as 1s 1 meaning 1 st s orbital w/ 1 e -

9 Quantum #s Examples Phosphorous – # of e - s = [recall: atoms are neutral] = 15 e - s determine shells 15 e - s; fill from bottom up notation: 1s 2 2s 2 2p 6 3s 2 3p 3

10 Quantum #s Examples Manganese – # of e - s = [recall: atoms are neutral] = 25 e - s determine shells 25 e - s; fill from bottom up notation: 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 5

11 Quantum #s & Periodic Table Period Indicates Quantum Numbers!!! Just count across the periods…


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