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Unit 2F

Electron Configuration

QuestionAnswer
Ground State electrons are in the lowest possible energy level
Excited State one or more electrons occupy higher energy level
Rule 1 Orbitals fill in the order of increasing energy levels from lowest to highest
Rule 2 Each orbital can hold 2 electrons with opposite spin
Rule 3 When there is a subshell of equal energy, each orbital becomes half-filled before any of them becomes completely filled.
1 box 1 orbital
Group of boxes 1 subshell
Number energy level
Letter orbital shape
s 1 box
p 3 boxes
d 5 boxes
Remembering order 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d
Technetium - #43 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2, 3d^10, 4p^6, 5s^2, 4d^5
Created by: edith1234
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