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Wize University Chemistry Textbook > Quantum Numbers and Electron Configurations

Electronic Configuration for Atoms

Orbital Filling Diagrams Previous Section
Electron Configurations for Ions Next Section
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Electron Configurations of Atoms


  • Label blocks
  • describe the n number for each block

Simple Electron Configurations


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Shorthand Notations
Write the name of the previous noble gas and then fill in the rest of the electron configuration.



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Electron Configurations Cheatsheet







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Electron Configuration Exceptions

Transition metals have their valence electrons in the d subshell.
It is a lot more favourable (and stable) to have d shell either half full or totally full instead of just partially full.


Wize Tip
The other exceptions that follow this same trend are: Mo, Ag, and Au! (Note that they are in the same groups that Cr and Cu are in!)

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Example: Writing Out Electron Configurations

Part 1:

Write the full electronic configurations for the following elements:

P:
1s2 2s2 2p6 3s2 3p3

Se:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4

Part 2:

Write the short electron configurations for the following elements:

Zn:
[Ar] 4s2 3d10

Zr:
[Kr] 5s2 4d2



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Example: Condensed Electron Configuration

What is the condensed electronic configuration for Mo?







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We ignore everything before the previous noble gas (Kr), which means we are only working with the 5s and 4d blocks. Let's fill them up:



But there is something special about Mo. It is in group 6. This group tends to fill (or in this case half-fill) the d-block at the expense of the s block.


Therefore, the electronic configuration is [Kr]5s14d5.


Practice: Identify the Neutral Element

What neutral element is represented in the example below?

1s22s22p63s23p51s^2 2s^22p^63s^23p^5became [Ne]3s23p5 [Ne]3s^23p^5

Practice: Electron Configuration

The ground state electronic configuration for At is


Practice: Impossible Electron Configuration

Which of the following electronic configurations is not possible?


Extra Practice
Atom: Electron Configuration
The ground state electronic configuration for Cr is
Cr
Quantum Model: Stable Electron Configurations
Stable electron configurations are likely to contain:
1s22s22p63s23p51s^2 2s^22p^63s^23p^5or [Ne]3s23p5 [Ne]3s^23p^5
What neutral element is represented in the above?
Electronic configuration
What is the electronic configuration of the synthesized halogen?
Electronic Structure
Complete the electronic configurations of arsenic and manganese to answer the following questions.
Electronic Configuration
Fill the table below on valence electronic configuration.
Electronic Configuration
Determine the abbreviated electronic configuration for the following atoms/ions.
a) P
b) Br-
Atomic Structure: Core and Valence Electrons
For a vanadium atom, what are the number of core and valence electrons?
Electronic Configuration
Fill the table below on valence electronic configuration.
Atom: Electronic Configuration
Determine which element will have the following electronic configurations.
Electronic Configuration
Determine the abbreviated electronic configuration for the following atoms/ions.
Atom: Electronic Configuration
Give the full electronic configurations of the following atoms/ions.
Atom: Electronic Configurarion
What is the ground state electronic configuration of Indium?
Atom: Electronic Configuration
Which electron configuration is INCORRECT for the ground state atom listed?
Quantum. model: Electronic Configuration
A gold (Au) atom has how many electrons with the quantum numbers n=4, ml=-3?
Quantum Model: Electronic Configuration
Krypton (Kr) atom has how many electrons with the quantum numbers n=3, l=2?
Atom: Electronic Configuration
Fill in the blanks using neutral atoms from the 4th period. Note there may be more than one answer.
____________ has a complete 3d shell
Atom: Electronic Configuration
Fill in the blanks using neutral atoms from the 4th period. Note there may be more than one answer.
A)
As
has a half filled 4p shell
B)
Cr
has 6 unpaired electrons
Atom: Electronic configuration
The ground state electronic configuration for Ti is
What is the condensed electronic configuration for each of the following? (note: don't leave any spaces in your answer)
"The Periodic Table", image retrieved from Chemistry 2e (https://d3bxy9euw4e147.cloudfront.net/oscms-prodcms/media/documents/Chemistry2e-OP_QCzV58S.pdf) by Flowers, P et al., is licensed under CC BY.
Atom: Electronic Configuration
Write the condensed electron configuration for ground state Cr and then write the configurations for
Cr3+ and Cr6+
a) Cr b) Cr3+ c) Cr6+
Write the condensed electron configuration for Mo.
Write the condensed electron configuration for titanium (Ti).
Write the condensed electron configuration for magnesium.
Write the electron configuration for sulphur.
Atom: Electronic Configuration
Identify the following atom or ion and decide whether it is in a ground or excited state
Z = 25 electronic configuration : [Ar]4s13d5[Ar]4s^13d^5
Atom: Electronic Configuration
Which of the following is the correct condensed electronic configuration for Zn?
Aufbau Principle
The Aufbau Principle states that:
Pauli Exclusion Principle
The Pauli Exclusion principle states:
Electronic Configuration
The ground state electronic configuration for At is
Atom: Electronic Configuration
Which of the following electronic configurations is not possible?
"The Periodic Table", image retrieved from Chemistry 2e (https://d3bxy9euw4e147.cloudfront.net/oscms-prodcms/media/documents/Chemistry2e-OP_QCzV58S.pdf) by Flowers, P et al., is licensed under CC BY.
Elements: Electronic configuration
What is the full electronic configuration for Ag?
"The Periodic Table", image retrieved from Chemistry 2e (https://d3bxy9euw4e147.cloudfront.net/oscms-prodcms/media/documents/Chemistry2e-OP_QCzV58S.pdf) by Flowers, P et al., is licensed under CC BY.
A series of electron configurations are shown below for neutral species. Which is the most likely to form a stable +1 cation?
Atom: Electronic Configuration
For each of the elements listed in the first column (a-e) choose the electron configuration from the second column (f-j) which corresponds to that species ground state electron configuration. Note: you only need to write the letter which corresponds (ie. f) not the whole electron configuration.
a) Se f) [Ar]4s23d7
b) Ca2+ g) [Ar]4s23d104p4
The correct ground state elctron configuration for V is:
Atom: Electronic Configuration
What is the electron configuration for ground state sulfur?
Atom: Electronic Configurations
Which of the following electron configurations is incorrect?
Atom: Electronic Configuration
Which rule of quantum chemistry states that no two electrons can have identical quantum numbers?
Identifying neutral elements from electron configurations
What neutral element is represented in the example below?
1s22s22p63s23p51s^2 2s^22p^63s^23p^5became [Ne]3s23p5 [Ne]3s^23p^5
Electron Configuration: Astatine
The ground state electronic configuration for At is
Atom: Electron Configuration
The ground state electronic configuration for Cr is
Cr
Elements: Electron Configuration of Oxygen
Write the complete electron configuration for oxygen.
Identify the ion or atom with the ground state electron configuration 1s22s22p63s23p64s13d5
Which of the following pairs of species are isoelectronic? (Select all that apply)
Which of the following statements about the ground state electron configuration of Kr is INCORRECT?
Atoms: Electronic Configuration
Which of the representations for the arrangement of electrons in the ground-state atoms below is incorrect?
Atom: Electronic configuration
Which of the following orbital diagrams shows a valid ground state electron configuration for an uncharged atom?
Quantum model: Electron configuration
a) What is the full ground state electron configuration (spdf notation) of Al?
b) Draw the energy level diagram for Al.
c) Modify the energy diagram above to show the excited state that required the smallest amount of energy to move the highest energy valence electron to another orbital.
Quantum model: Ground and Excited States
In the energy diagram:
a) Identify all subshells by circling them.
b) Place the name of each subshell next to your circle.
Atom: Electronic Configuration
Which of the following statements is correct for a non-hydrogen atom?
Elements: Electron Configuration of Ions
For which of the atom/ions below, is the given electron configuration correct? (select all that apply)
Which of the following gives a correct valence electron configuration for an atom of chromium?
i. [Ar] 4s13d5
ii. [Ar] 4s23d4
Atom: Electronic Configuration
1s22s22p63s23p51s^2 2s^22p^63s^23p^5or [Ne]3s23p5 [Ne]3s^23p^5
What neutral element is represented in the above?
Atom: Electronic configuration
The electron configuration for element X is [Ne]3s2 3p5. The formula of the most probable compound that X will form with Ca is:
Atom: Electronic Configuration
How many electrons are found in the 2p subshell of ground state Al\text{Al}?
Atoms: Electronic Configuration
Which one of the following simple, shorthand, ground state electron configurations is incorrect for the elements given?
Atom: Electronic configuration
Given the ground-state electronic configuration
[Ar] 4s23d3
1. What is the neutral atom with this electronic configuration?
Atom: Electronic Configuration
Write the electronic configuration for the following species?
N+
Atom: Electronic configuration
Given the ground-state electronic configuration
[Ar] 4s23d3
1. What is the neutral atom with this electronic configuration?