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4-3
ELECTRON CONFIGURATIONS
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Beaker Breaker
1. An energy level of n=3 can hold how many electrons?
2. The second quantum number (Angular Momentum Quantum Number, l) for n=2 is_____________
3. The letter denotation (shapes) for n =2 is?
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Hund’s 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
• [Ar]4s2
• What is the noble gas config for S?
• 1s22s22p63s23p4
• [Ne]3s2 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:
1. Na2. Al3. Cl4. 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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ELEMENT ORBITAL
NOTATION
ELECTRON CONFIGURATION
NOTATION
Cr
Mn
Cu
Zn
jbechtel:
GO THRU Ca
jbechtel:
GO THRU Ca
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Beaker BreakerWrite the following notations for the
element nickel (Z=28):
• 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?