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Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter83: Location Of Points
Section: Chapter Questions
Problem 1A
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Pearson MyLak × P Course Home ✓
MasteringChen X
Use the orbital × |
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Phosphorus El
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session.chemistry-mastering.pearson.com/myct/itemView?assignmentProblemID=234894331
A
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<Chapter 9 HW
Electron Configurations
1L
G1
G1
1s
1s
G1 G1
G1
2s
Learning Goal:
To make orbital-filling diagrams and relate them to electron
configurations.
An electron configuration shows the occupation of orbitals by electrons
for a particular atom. For example, He has two electrons in the 1s
orbital. Therefore, the electron configuration of He is 1s².
Consider the following principles when writing the electron configuration
of an atom:
• Electrons occupy orbitals so as to minimize the energy of
the atom; therefore, lower-energy orbitals fill before higher-
energy orbitals. Orbitals fill in the following order:
•
•
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d.
According to the Pauli exclusion principle, orbitals can hold
no more than two electrons each, and when two electrons
occupy the same orbital, they must have opposing spins.
According to Hund's rule, when orbitals of identical energy
are available, these are first occupied singly with parallel
spins rather than in pairs.
25
2p
20
3s
2s
G1
20
2p
G1
G1
G1
3p
3s
G1
3d
G1
Зр
4s
4p
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