ELECTRON CONFIGURATIONS

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4-3

• ELECTRON CONFIGURATIONS

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Beaker Breaker

1. An energy level of n3 can hold how many
   electrons?
2. The second quantum number (Angular Momentum
   Quantum Number, l) for n2 is_____________
3. The letter denotation (shapes) for n 2 is?

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Hunds Rule

• Orbitals of equal energy are each occupied by one
  electron before any orbital is occupied by a
  second electron, and
• All electrons in singly occupied orbitals must
  have the same spin

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Relative Energies of Orbitals
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Order of increasing energy for each orbital
p. 105 and 110)
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Aufbau Principle

• An electron occupies the lowest-energy orbital
  that can receive it

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Beaker Breaker

• Write the orbital notation of Oxygen (O)
• Write the orbital notation of Ti

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Noble Gas Notation

• What is the noble gas configuration for calcium?
• 1s22s22p63s23p64s2
• Ar4s2
• What is the noble gas config for S?
• 1s22s22p63s23p4
• Ne3s2 3p4

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Beaker Partner Practice Problems

• The electron configuration of fluorine is
  1s22s22p5 What is the atomic number of
  fluorine? How many of its p orbitals are filled?
  How many unpaired electrons does a fluorine atom
  contain?
• Write the electron configuration, noble gas
  configuration and orbital notation for
• Na
• Al
• Cl
• P

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Beaker Breaker Problem

• Complete the electron configuration and noble-gas
  configuration only of
• chlorine (Cl)
• Open books to page 110 please

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Objective

• Describe the electron configurations for the
  atoms of any element using oribital notation,
  electron-configuration notation and when
  appropriate, noble-gas notation.

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Beaker Partner Activity

• Complete the electron configuration and noble gas
  configuration only of the following elements
• Cadmium (Cd)
• Tin (Sn)

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Objective

• Describe the electron configurations for the
  atoms of any element using oribital notation,
  electron-configuration notation and when
  appropriate, noble-gas notation.

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PREDICTED
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PreClass Write the following notations for the
element chromium (Z 24)

• Electron configuration
• Orbital notation
• Noble gas

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jbechtel GO THRU Ca
ELEMENT ORBITAL NOTATION ELECTRON CONFIGURATION NOTATION
Cr
Mn
Cu Zn
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Beaker BreakerWrite the following notations for
the element nickel (Z28)

• Orbital notation
• Electron configuration
• Noble gas

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PreClass Write the following notations for the
element bismuth (Z 83)

• Electron configuration
• Orbital notation
• Noble gas

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Why can the 3rd energy level hold 18 electrons?