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Electronic Configuration

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Q. What is the electronic configuration of a chlorine ion (Cl-)?
  • A. 1s2 2s2 2p6 3s2 3p5
  • B. 1s2 2s2 2p6
  • C. 1s2 2s2 2p6 3s2 3p6
  • D. 1s2 2s2 2p6 3s2 3p4
Q. What is the electronic configuration of a neutral oxygen atom?
  • A. 1s2 2s2 2p4
  • B. 1s2 2s2 2p6
  • C. 1s2 2s2 2p2
  • D. 1s2 2s2 2p5
Q. What is the electronic configuration of a neutral sodium atom?
  • A. 1s2 2s2 2p6 3s1
  • B. 1s2 2s2 2p6
  • C. 1s2 2s2 2p5
  • D. 1s2 2s2 2p6 3s2
Q. What is the electronic configuration of a sodium ion (Na+)?
  • A. 1s2 2s2 2p6
  • B. 1s2 2s2 2p6 3s1
  • C. 1s2 2s2 2p5
  • D. 1s2 2s2 2p6 3s2
Q. What is the electronic configuration of Chlorine?
  • A. 1s2 2s2 2p6 3s2 3p5
  • B. 1s2 2s2 2p6 3s2 3p4
  • C. 1s2 2s2 2p6 3s2 3p6
  • D. 1s2 2s2 2p6 3s2 3p3
Q. What is the electronic configuration of Iron?
  • A. [Ar] 4s2 3d6
  • B. [Ar] 4s2 3d8
  • C. [Ar] 4s2 3d5
  • D. [Ar] 4s2 3d7
Q. What is the electronic configuration of oxygen?
  • A. 1s2 2s2 2p4
  • B. 1s2 2s2 2p6
  • C. 1s2 2s2 2p2
  • D. 1s2 2s2 2p5
Q. What is the electronic configuration of the chloride ion (Cl-)?
  • A. 1s2 2s2 2p6 3s2 3p5
  • B. 1s2 2s2 2p6 3s2 3p6
  • C. 1s2 2s2 2p6 3s2 3p4
  • D. 1s2 2s2 2p6 3s2 3p3
Q. What is the electronic configuration of the element with atomic number 12?
  • A. [Ne] 3s2
  • B. [He] 2s2 2p6
  • C. [Ne] 3s1
  • D. [Ar] 4s2
Q. What is the electronic configuration of the element with atomic number 15?
  • A. [Ne] 3s2 3p3
  • B. [Ne] 3s2 3p4
  • C. [Ne] 3s2 3p5
  • D. [Ne] 3s2 3p2
Q. What is the electronic configuration of the element with atomic number 17?
  • A. 1s2 2s2 2p6 3s2 3p5
  • B. 1s2 2s2 2p6 3s2 3p4
  • C. 1s2 2s2 2p6 3s2 3p6
  • D. 1s2 2s2 2p6 3s2 3p3
Q. What is the electronic configuration of the element with atomic number 20?
  • A. [Ne] 3s2 3p6
  • B. [Ar] 4s2
  • C. [He] 2s2 2p6 3s2 3p6
  • D. [Ne] 3s2 3p4
Q. What is the electronic configuration of the element with atomic number 26?
  • A. [Ar] 4s2 3d6
  • B. [Ar] 4s2 3d5
  • C. [Kr] 5s2 4d6
  • D. [Ar] 4s1 3d7
Q. What is the electronic configuration of the element with atomic number 29?
  • A. [Ar] 4s2 3d9
  • B. [Ar] 4s2 3d10
  • C. [Kr] 5s1 4d10
  • D. [Ne] 3s2 3p6
Q. What is the electronic configuration of the iron (Fe) atom?
  • A. [Ar] 4s2 3d6
  • B. [Ar] 4s2 3d5
  • C. [Ar] 4s1 3d7
  • D. [Ar] 4s2 3d4
Q. What is the electronic configuration of the nitrogen atom?
  • A. 1s2 2s2 2p3
  • B. 1s2 2s2 2p4
  • C. 1s2 2s2 2p2
  • D. 1s2 2s2 2p5
Q. What is the electronic configuration of the potassium ion (K+)?
  • A. 1s2 2s2 2p6 3s2
  • B. 1s2 2s2 2p6
  • C. 1s2 2s2 2p6 3s1
  • D. 1s2 2s2 2p6 3s2 3p1
Q. What is the electronic configuration of the sodium ion (Na+)?
  • A. 1s2 2s2 2p6
  • B. 1s2 2s2 2p5
  • C. 1s2 2s2 2p4
  • D. 1s2 2s2 2p3
Q. What is the maximum number of electrons that can occupy the 3rd energy level?
  • A. 2
  • B. 8
  • C. 18
  • D. 32
Q. What is the total number of electrons in the electronic configuration [Kr] 5s2 4d10 5p5?
  • A. 36
  • B. 47
  • C. 54
  • D. 53
Q. Which element has the electronic configuration 1s2 2s2 2p6 3s2 3p1?
  • A. Al
  • B. Si
  • C. P
  • D. Cl
Q. Which element has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2?
  • A. Arsenic
  • B. Calcium
  • C. Krypton
  • D. Titanium
Q. Which of the following configurations is incorrect?
  • A. 1s2 2s2 2p6 3s2
  • B. 1s2 2s2 2p6 3s2 3p6
  • C. 1s2 2s2 2p6 3s2 3p1
  • D. 1s2 2s2 2p6 3s2 3p5
Q. Which of the following configurations represents a noble gas?
  • A. 1s2 2s2 2p6
  • B. 1s2 2s2 2p5
  • C. 1s2 2s2 2p4
  • D. 1s2 2s2 2p3
Q. Which of the following configurations represents a transition metal?
  • A. [Ar] 4s2 3d10
  • B. [Ne] 3s2 3p6
  • C. [Kr] 5s2 4d5
  • D. [Xe] 6s2
Q. Which of the following elements has a half-filled p subshell?
  • A. Boron
  • B. Carbon
  • C. Nitrogen
  • D. Oxygen
Q. Which of the following elements has an incomplete d subshell?
  • A. Sc
  • B. Ti
  • C. V
  • D. Cr
Q. Which of the following elements has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2?
  • A. Ca
  • B. Ar
  • C. Kr
  • D. Xe
Q. Which of the following elements has the electronic configuration ending in 4p5?
  • A. Br
  • B. Cl
  • C. I
  • D. At
Q. Which of the following elements has the electronic configuration [Kr] 5s2 4d10 5p5?
  • A. Iodine
  • B. Bromine
  • C. Astatine
  • D. Tellurium
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Electronic Configuration MCQ & Objective Questions

Understanding electronic configuration is crucial for students preparing for school and competitive exams in India. This topic lays the foundation for various concepts in chemistry and physics, making it essential for scoring well. Practicing MCQs and objective questions on electronic configuration not only enhances conceptual clarity but also boosts confidence during exams.

What You Will Practise Here

  • Fundamentals of electronic configuration and its significance
  • Aufbau principle, Pauli exclusion principle, and Hund's rule
  • Electron shells, subshells, and orbital diagrams
  • Valence electrons and their role in chemical bonding
  • Common electronic configurations of elements in the periodic table
  • Practice questions on electronic configuration for various elements
  • Understanding exceptions in electronic configurations

Exam Relevance

Electronic configuration is a vital topic in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect questions that require them to determine the electronic configuration of elements, identify valence electrons, or explain the significance of specific configurations. Common question patterns include fill-in-the-blank formats, multiple-choice questions, and conceptual application scenarios.

Common Mistakes Students Make

  • Misunderstanding the order of filling orbitals according to the Aufbau principle
  • Confusing the concepts of valence electrons and core electrons
  • Overlooking exceptions in electronic configurations for transition metals
  • Failing to accurately represent electron configurations in orbital diagrams

FAQs

Question: What is electronic configuration?
Answer: Electronic configuration describes the distribution of electrons in an atom's orbitals, indicating how electrons are arranged around the nucleus.

Question: Why is practicing MCQs on electronic configuration important?
Answer: Practicing MCQs helps reinforce understanding, identify weak areas, and improve problem-solving speed, which is crucial for exam success.

Now is the time to enhance your understanding of electronic configuration! Dive into our practice MCQs and test your knowledge to excel in your exams.

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