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Class 9 Chemistry · Chapter 2 · Test 3

Electronic Configuration

25 MCQs • Practice electron shells, energy levels, shell capacities, subshells, and the arrangement of electrons in atoms.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

  1. Question 1

    What are the fixed energy levels around the nucleus called in Bohr's atomic model?

    • ASubshells
    • BShells
    • COrbitals
    • DNuclei
    Show answer

    Answer: B

    Bohr described electrons as occupying fixed energy levels called shells.

  2. Question 2

    Which letter represents the first electron shell?

    • AL
    • BK
    • CM
    • DN
    Show answer

    Answer: B

    The first shell is called the K shell.

  3. Question 3

    Which shell has the principal quantum number n = 3?

    • AK
    • BL
    • CM
    • DN
    Show answer

    Answer: C

    The M shell is the third shell and has n = 3.

  4. Question 4

    Which shell is farther from the nucleus than the K and L shells?

    • AK
    • BL
    • CM
    • DAll are equally distant
    Show answer

    Answer: C

    The M shell is farther from the nucleus than the K and L shells.

  5. Question 5

    What generally happens to electron energy as the shell becomes farther from the nucleus?

    • AIt decreases
    • BIt increases
    • CIt becomes zero
    • DIt remains unchanged
    Show answer

    Answer: B

    Electrons in shells farther from the nucleus generally have higher energy.

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