Download Finish Calculations Start Quantum Numbers

Finish Calculations
Start Quantum Numbers
GT Chemistry 11/5/14
Drill
 Calculate the frequency and wavelength of a
wave with E = 3.0 x 10-15 J.
 nu = 4.5 x 1018 Hz
 lambda = 6.7 x 10-11 m = 0.067 nm
 HW: Finish #14-17 on Light WS
Languid
 lacking energy; weak; showing little interest
in anything
 After eating seven Snickers bars on
Halloween, I lay languidly on my couch.
Objectives
 IWBAT
 Calculate wavelength and frequency for any
photon.
 Calculate energy for any photon.
 Write quantum numbers for any final electron in
an element.
 NOTE:
 STEM Conclusion due 11/14 (Friday)
 EM Spectrum calculations & Quantum Quiz on
11/10 (Monday)
HW Review
 Let’s go over Light WS
 #1-6 verbally
 #7-13 on board
Quantum Numbers
 What are the two quantum numbers we
already know?
 (Hint: n, l)
Quantum Numbers Activity
Quantum Numbers
 Quantum numbers tell us properties of the atomic orbitals,
and electrons, in an atom.
 Like giving each electron its own address
 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)
Textbook
 You will need a textbook to look up information about the
quantum numbers.
 Take out a sheet of paper and divide it into quadrants.
Principal Quantum Number
Angular Momentum
Quantum Number
Magnetic Quantum Number
Spin Quantum Number
Know for each Quantum #
 Definition
 Symbol
 The allowed values
 An example
 A visual representation of the quantum number
Review Quantum Numbers as a Class
Discussion of the 4 types of quantum
numbers and their properties
Quantum Number Review Notes
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
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
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 values available are
equal to 0 to n -1 ( l = 0  n-1)
Magnetic Quantum Numbers
 Definition: represents the orientation of an
orbital around the nucleus
 Symbol: ml
 Values: ml = - l l
 for an s-orbital, 0
 for a p-orbital, -1, 0 , 1
 for a d-orbital,-2, -1, 0, 1, 2
 
Spin Quantum Numbers
 Definition: represents the spin
states of electrons in an orbital
 Symbol: ms
 Values: +½ , -½
 Positive – spin up
 Negative – spin down
Can an e- be described by the following set
of quantum numbers?
n=2, l=1, ml= -1
All quantum numbers are allowed values
Can an e- be described by the following set
of quantum numbers?
n=1, l=1, ml= +1
Not possible.
The value of l must be less than the value of n.
Can an e- be described by the following set
of quantum numbers?
n=7, l=3, ml= +3
All the quantum numbers are allowed
values.
Can an e- be described by the following set
of quantum numbers?
n=3, l=1, ml=-3
Not possible.
The value of ml must be in the range
-l to +l
Replace the ? Mark with an
appropriate quantum number.
n=3, l=1, ml=?
n=4, l=?, ml=-2
n=?, l=3, ml=?
Can an e- be described by the following set
of quantum numbers?
n=2, l=1, ml=-2
n=3, l=2, ml=+2
n=4, l=3, ml=+3
n=5, l=2, ml=+3
 No
 Yes
 Yes
 No
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
Hydrogen’s electron
 Write electron configuration
 Draw orbital diagram
 n= 1
 l= 0
 ml= 0
 ms= +1/2
Helium’s second electron
 Write electron configuration
 Draw orbital diagram
 n= 1
 l= 0
 ml= 0
 ms= -1/2
Lithium’s third electron
 Write electron configuration
 Draw orbital diagram
 n= 2
 l= 0
 ml= 0
 ms= +1/2
Fluorine’s 6th electron
 Write electron configuration
 Draw orbital diagram
 n= 2
 l= 1
 ml= 0
 ms= +1/2
Exit Ticket
 What are the quantum numbers for the last
electron in Neon?