Electron Configuration Quiz

practice problems electron configuration

This online quiz is intended to give you extra practice in writing electron configurations for each of the first 102 chemical elements. This quiz aligns with the following NGSS standard(s): HS-PS1-1 , HS-PS1-2

Select your preferences below and click 'Start' to give it a try!

practice problems electron configuration

Which of the following is the correct electron configuration for the bromide ion, Br-?

a) [Ar] 4s 2 4p 5

b) [Ar] 4s 2 3d 10 4p 5

c) [Ar] 4s 2 3d 10 4p 6

d) [Ar] 4s 2 3d 10 4p 6 5s 1

e) [Ar] 4s 2 3d 10 3p 6

text explanation

Which of the following elements has the largest number of electrons for which the principal quantum number, n , is 3?

Which is the first element to have 4d electrons in its electron configuration?

  • Chemistry Concept Questions and Answers

Electron Configuration Questions

Electron Configuration signifies the number of electrons in an atomic orbital. The electrons are filled from the lowest energy orbital to the highest energy orbital. This representation of electron filling is given by electron configuration. The electron filled atomic orbitals are placed in a sequence. For example, Lithium (atomic number = 3) has three electrons. Its electron configuration is 1s 2 2s 1 .

Electron Configuration Chemistry Questions with Solutions

Q1. What is the electron configuration of the element Potassium?

Answer: The atomic number of Potassium is 19. A neutral Potassium element has 19 electrons. Its electron configuration is 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 or simply put [Ar] 4s 1 .

Q2. What is the total number of electrons that can be filled in s, p and d subshells?

Answer: The s subshell can accommodate a maximum of 2 electrons as it has only 1 orbital. The p subshell has 3 orbitals. Each orbital can accommodate a maximum of 2 electrons. Thus the p subshell can accommodate a maximum of 6 electrons. The d subshell has 5 orbitals and thus can accommodate a maximum of 10 electrons.

Q3. What is Hund’s rule of maximum multiplicity? Give an example.

Answer: Hund’s rule states that the electrons singly occupy the orbitals before pairing up. Also, the singly occupied electrons in the orbitals have the same spin maximizing the total spin. This is Hund’s rule of maximum multiplicity.

Example: The correct and incorrect way of filling atomic orbitals in accordance with Hund’s rule for carbon atom (atomic number: 6) is shown below.

practice problems electron configuration

Q4. Explain Pauli’s Exclusion Principle.

Answer: Pauli’s exclusion principle states that no two electrons in the atom can have the same set of 4 quantum numbers. The two electrons in the same orbital should have antiparallel spins.

practice problems electron configuration

Q5. Explain Aufbau Principle.

Answer: Aufbau principle states that electrons occupy the lowest energy atomic orbitals first before occupying the higher energy atomic orbitals. The principal quantum number (n = 1, 2, 3…) signifies the energy of the orbitals. Higher the principal quantum number greater the energy of the orbital. The 1s orbital is the lowest energy orbital followed by 2s, 2p and so on.

practice problems electron configuration

Q6. What is the maximum number of electrons that can be filled in a particular energy level?

Answer: The maximum number of electrons that can be filled in a particular energy level is 2n 2 , where n is the principal quantum number. For example, the maximum number of electrons in energy level n=3 is:

2 ✖ (3) 2 = 18 electrons.

Q7. Match the following items of column 1 with column 2 and choose the correct answer :

Q8. Match the following items of column 1 with column 2 and choose the correct answer:

Q9. How many electrons are there in the K, L, M and N shell?

Answer: There are 2 electrons in the K shell, 8 electrons in the L shell, 18 electrons in the M shell and 32 electrons in the N shell.

Q10. Which is the orbital occupied by the last electron in the Boron element?

Answer: (b)

The electron configuration of Boron is 1s 2 2s 2 2p 1

Q11. What is the formula to calculate azimuthal quantum number?

Answer: The azimuthal quantum number (l) is calculated by the formula l = n-1 where (n = 1,2, 3..). The value of l ranges from 0, 1, 2, 3….(n-1).

Q12. What is the formula to calculate magnetic quantum number?

Answer: The magnetic quantum number m is calculated by m = 2l + 1. The value of m ranges from -l to +l.

Q13. What are the two spin levels of electron?

Answer: The two spin levels of electron are -½ and +½.

Q14. What is the octet rule?

Answer: The octet rule states that elements attain stable electronic configuration when their valence shell is completely filled with 8 electrons.

Q15. What is the atomic number of Calcium (Ca) ?

Answer: (a).

The electronic configuration of Calcium is [Ar] 4s 2 .

Practice Questions on Electronic Configuration

Q1. What is the general electronic configuration of f-block elements?

Q2. What is the general electronic configuration of Lanthanides?

Q3. What is the general electronic configuration of Actinides?

Q4 . What is the electronic configuration of Neon?

Q5. What is the electronic configuration of Aluminum?

Click the PDF to check the answers for Practice Questions. Download PDF

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Chemistry LibreTexts

2.7: Unit 2 Practice Problems

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  • Page ID 259620

Question 1. 

Which subatomic particle(s) determine an atom's name ?

protons and neutrons

Which subatomic particle(s) determine an atom's mass ?

Which subatomic particle(s) determine an atom's charge ?

electrons and protons

Question 2.

Write the symbol for each of the following ions:

(a) the ion with a 1+ charge, atomic number 55, and mass number 133

(b) the ion with 54 electrons, 53 protons, and 74 neutrons

(c) the ion with atomic number 15, mass number 31, and a 3− charge

Question 3.

How many protons, neutrons, and electrons are in the following?

(a)    87 Sr +2

(b)    75 As

Question 4.

According to Bhor's model, how many electrons are in the 4th energy level?

# electrons = 2(4) 2  = 32 electrons

Question 5. 

Give the electron configuration for Ge using quantum mechanical notation.  

1s 2 2s 2  2p 6 3s 2   3p 6  4s 2  3d 10 4p 2

Question 6. 

Give the electron configuration for Lu using noble gas configuration.   

[Xe] 6s 2  4f 14  5d 1

Question 7. 

Give the electron configuration for S -2  using quantum mechanical notation.  

1s 2 2s 2  2p 6 3s 2   3p 6

Question 8. 

Which atom has the electron configuration: 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 10 4 p 6 5 s 2 4 d 2 ?

Contributors and Attributions

Paul Flowers (University of North Carolina - Pembroke), Klaus Theopold (University of Delaware) and Richard Langley (Stephen F. Austin State University) with contributing authors.  Textbook content produced by OpenStax College is licensed under a Creative Commons Attribution License 4.0 license. Download for free at http://cnx.org/contents/[email protected] ).

  • Christy VanRooyen, Oregon Tech

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Chemistry library

Course: chemistry library   >   unit 7.

  • Drawing dot structures
  • Drawing Lewis diagrams
  • Worked example: Lewis diagram of formaldehyde (CH₂O)
  • Worked example: Lewis diagram of the cyanide ion (CN⁻)
  • Worked example: Lewis diagram of xenon difluoride (XeF₂)
  • Exceptions to the octet rule

Counting valence electrons

  • Lewis diagrams
  • Resonance and dot structures
  • Formal charge
  • Formal charge and dot structures
  • Worked example: Using formal charges to evaluate nonequivalent resonance structures
  • Resonance and formal charge
  • VSEPR for 2 electron clouds
  • VSEPR for 3 electron clouds
  • More on the dot structure for sulfur dioxide
  • VSEPR for 4 electron clouds
  • VSEPR for 5 electron clouds (part 1)
  • VSEPR for 5 electron clouds (part 2)
  • VSEPR for 6 electron clouds
  • Molecular polarity
  • 2015 AP Chemistry free response 2d and e
  • Your answer should be
  • an integer, like 6 ‍  

IMAGES

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  5. Electron Configuration Practice Worksheet Answers Printables

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  6. 14 Electron Configuration Worksheet With Answers / worksheeto.com

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VIDEO

  1. Electron Configuration Practice

  2. Electron Configuration Part 1

  3. Electron Configuration Part 2

  4. Electron Configuration Part 3

  5. Electron Configuration Part 5

  6. Electron Configuration Part 7

COMMENTS

  1. Electron Configuration Quiz : ChemQuiz.net

    This online quiz is intended to give you extra practice in writing electron configurations for each of the first 102 chemical elements. This quiz aligns with the following NGSS standard (s): HS-PS1-1, HS-PS1-2 Select your preferences below and click 'Start' to give it a try!

  2. Electron configurations (practice)

    Electron configurations (practice) | Khan Academy Chemistry library Course: Chemistry library > Unit 7 Lesson 4: Electron configurations Shells, subshells, and orbitals Introduction to electron configurations Noble gas configuration Electron configurations for the first period Electron configurations for the second period

  3. 3.1: Electron Configurations (Problems)

    PROBLEM 3.1.12 3.1. 12. In one area of Australia, the cattle did not thrive despite the presence of suitable forage. An investigation showed the cause to be the absence of sufficient cobalt in the soil. Cobalt forms cations in two oxidation states, Co 2+ and Co 3+. Write the electron structure of the two cations. Answer.

  4. Practice Problems for Electronic Configuration

    Which of the following is the correct electron configuration for the bromide ion, Br-? Which is the first element to have 4d electrons in its electron configuration?

  5. 2.4 Electron Configurations

    In this case, 2+2+6+2+6+2+10+6+2+1= 39 and Z=39, so the answer is correct. A slightly more complicated example is the electron configuration of bismuth (symbolized Bi, with Z = 83). The periodic table gives the following electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p65s2 4d10 5p6 6s2 4f14 5d10 6p3.

  6. Electron Configuration Questions

    Answer: The atomic number of Potassium is 19. A neutral Potassium element has 19 electrons. Its electron configuration is 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 or simply put [Ar] 4s 1. Q2. What is the total number of electrons that can be filled in s, p and d subshells?

  7. 2.7: Unit 2 Practice Problems

    Answer. 2.7: Unit 2 Practice Problems is shared under a CC BY license and was authored, remixed, and/or curated by LibreTexts. Back to top. 2.6: Electron Configurations. 2.8: Electromagnetic Energy - Lab 4. Practice problems with solutions for unit 2 including atomic structure, periodic table, and electron configurations.

  8. The Electron Configuration Practice Problems

    1 PRACTICE PROBLEM Following the aufbau principle, identify the orbital filled after the orbitals listed below: i) 3p ii) 4f iii) 2s iv) 5d 2 PRACTICE PROBLEM Following the aufbau principle, identify the atomic number with a completed 8p orbital. 3 PRACTICE PROBLEM Identify the atomic number where the 8s orbital starts to be filled.

  9. The Electron Configuration (Simplified) Practice Problems

    Provide the orbital diagram for Te using its ground-state electron configuration. 5 PRACTICE PROBLEM Identify the element that has the following electron configuration: 1s 2 2s 2 2p 6 3s 1

  10. Electron Configuration

    This chemistry video tutorial provides a basic introduction into electron configuration. It contains plenty of practice problems including the electron conf...

  11. Practice Problem: Electron Configuration and Quantum Numbers

    Try again. Channels are designed to help you quickly and easily understand complex concepts using short videos and practice.

  12. Electron Configuration Practice Problems with Step by Step Answers

    1.4K 51K views 5 years ago Practice some electron configuration problems that you may possibly see on your next quiz or exam! In this video, you'll practice 3 different electron...

  13. PDF Electron Configuration Practice Worksheet

    Electron Configurations - Solutions Note: The electron configurations in this worksheet assume that lanthanum (La) is the first element in the 4f block and that actinium (Ac) is the first element in the 5f block. If your periodic table doesn't agree with this, your answers for elements near the f-orbitals may be slightly different. 1) oxygen

  14. PDF Electron Configuration Practice Worksheet

    An electron configuration is a method of indicating the arrangement of electrons about a nucleus. A typical electron configuration consists of numbers, letters, and superscripts with the following format: A number indicates the energy level (The number is called the principal quantum number.). A letter indicates the type of orbital; s, p, d, f.

  15. Orbital Diagrams and Electron Configuration

    Orbital Diagrams and Electron Configuration - Basic Introduction - Chemistry Practice Problems The Organic Chemistry Tutor 7.45M subscribers Join Subscribe Subscribed 11K 830K views 6 years...

  16. The Electron Configuration Video Tutorial & Practice

    Learn The Electron Configuration with free step-by-step video explanations and practice problems by experienced tutors. Skip to main content. General Chemistry ... We begin with one s when we're doing the full ground state electron configuration, often element or an ion to help us with this, you could take the off ball diagram approach when we ...

  17. Electron Configuration Practice Flashcards

    Practice with electron configuration. Learn with flashcards, games, and more — for free.

  18. Electron Configuration and Orbital Diagrams Practice Problems

    This video is a great way to practice finding the complete electron configuration, the condensed electron configuration, the orbital diagrams, the valence el...

  19. Free Printable Electron Configuration Worksheet [Practice & Problems] +PDF

    Our electron configuration worksheets provide focused practice determining configurations for atoms and ions. These worksheets are ideal for students studying quantum theory in high school or college introductory chemistry. The worksheets provide clear explanations and examples of the Aufbau principle, Hund's rule, and Pauli exclusion principle.

  20. The Electron Configuration: Condensed Practice Problems

    14 8 PRACTICE PROBLEM Both Aluminum (Al) and Gallium (Ga) form chlorides as MCl3 and oxides as M2O3. Show their condensed electron configuration and explain this behavior. 6 9 PRACTICE PROBLEM Identify the element that has the following electron configuration: [Ar]4s 2 3d 10 4p 3. 24 10 PRACTICE PROBLEM

  21. Counting valence electrons (practice)

    Lesson 4: Dot structures and molecular geometry. Drawing dot structures. Drawing Lewis diagrams. Worked example: Lewis diagram of formaldehyde (CH₂O) Worked example: Lewis diagram of the cyanide ion (CN⁻) Worked example: Lewis diagram of xenon difluoride (XeF₂) Exceptions to the octet rule. Counting valence electrons. Lewis diagrams.

  22. Electron and Noble Gas Configuration Practice Flashcards

    Noble gas configuration of Tin. [Kr] 5s2 4d10 5p2. Noble gas configuration of Berillium. [He] 2s2. Noble gas configuration of Cobalt. [Ar] 4s2 3d7. Study with Quizlet and memorize flashcards containing terms like Electron Configuration of Lithium, Electron Configuration of Nitrogen, Electron Configuration of Calcium and more.

  23. The Electron Configuration: Quantum Numbers Practice Problems ...

    1 6 PRACTICE PROBLEM For the element Ba, provide the four quantum numbers (n, l, m l, and m s) that describe its outermost two electrons. 2 7 PRACTICE PROBLEM Mercury exists in nature as Hg, Hg +, and Hg 2+. Mercury loses an electron when it goes from Hg + to Hg 2+. Give the n and l quantum numbers of the electron lost from this transition. 1