Quantum Numbers Activity

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Quantum Numbers Activity
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Quantum Numbers

• Quantum numbers tell us properties of the atomic
  orbitals, and electrons, in an atom.
• Like giving each electron its own addres
• An orbital is a 3-D region of an atom where there
  is a high probability of finding electrons (NOT
  an actual ring NOT like the planetary orbitals)

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Principal Quantum Number
Angular Momentum Quantum Number
Magnetic Quantum Number
Spin Quantum Number
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Textbook

• You will need a textbook to look up information
  about the quantum numbers. Pg. 101.

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Know for each Quantum

• Definition
• Symbol
• The allowed values
• An example
• A visual representation of the quantum number

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Review Quantum Numbers as a Class

• Discussion of the 4 types of quantum numbers and
  there properties

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Quantum Number Review Notes
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Quantum Numbers

• Used to describe various properties of the
  orbitals
• Each electron is assigned a set of four quantum
  numbers which, in order, are n, l, ml , and ms
• Like giving each electron its own address

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Principle quantum number

• Definition indicates the main energy level
  occupied by the electron
• Symbol n
• Values (written as integers) 1,2,3,4,5,6,7

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Angular Momentum Quantum Numbers

• Definition indicates the shape of the orbital
• Symbol l
• Values
• 0 s
• 1 p
• 2 d
• 3 f
• For a specific energy level, the number of
  orbital shapes available is equal to n -1

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Magnetic Quantum Numbers

• Definition represents the orientation of an
  orbital around the nucleus
• Symbol ml
• Values for a p-orbital -1, 0 , 1

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Spin Quantum Numbers

• Definition represents the spin states of
  electrons in an orbital
• Symbol ms
• Values 1/2, - ½

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Can an e- be described by the following set of
quantum numbers?

• n2, l1, ml -1
• All quantum numbers are allowed values

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Can an e- be described by the following set of
quantum numbers?

• n1, l1, ml 1
• Not possible.
• The value of l must be less than the value
• of n.

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Can an e- be described by the following set of
quantum numbers?

• n7, l3, ml 3
• All the quantum numbers are allowed
• values.

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Can an e- be described by the following set of
quantum numbers?

• n3, l1, ml-3
• Not possible.
• The value of ml must be in the range
• -l to l

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Replace the ? Mark with an appropriate quantum
number.

• n3, l1, ml?
• n4, l?, ml-2
• n?, l3, ml?

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Can an e- be described by the following set of
quantum numbers?

• n2, l1, ml-2
• n3, l2, ml2
• n4, l3, ml3
• n5, l2, ml3

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Writing Quantum Numbers

• You can identify the quantum numbers for any
  electron in an element
• Start by writing out the the electron
  configuration and orbital diagram for the element
• Locate the electron in the orbital diagram that
  you are solving the quantum number for
• Determine the 4 quantum numbers

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Hydrogens electron

• Write electron configuration
• Draw orbital diagram
• n 1
• l 0
• ml 0
• ms 1/2

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Heliums second electron

• Write electron configuration
• Draw orbital diagram
• n 1
• l 0
• ml 0
• ms -1/2

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Lithiums third electron

• Write electron configuration
• Draw orbital diagram
• n 2
• l 0
• ml 0
• ms 1/2

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Flourines 6th electron

• Write electron configuration
• Draw orbital diagram
• n 2
• l 1
• ml 0
• ms 1/2