Distribution of Electrons in Different ShellsPractice Questions & MCQs
Practice Distribution of Electrons in Different Shells questions from Structure of the Atom (Class 9 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Distribution of Electrons in Different ShellsQuiz - Solve & Score
Q1. An exam invigilator hands out a problem about aluminium. Excluding the valence shell, how many electrons of aluminium lie in the inner shells?
- A.12
- B.3
- C.10
- D.13
Answer: C. 10
aluminium is 2,8,3; total 13 minus the 3 valence electrons leaves 10 in the inner shells.
Q2. An entrance-test passage describes the element fluorine. In a fluorine atom, how many electrons fill the shell just below the valence shell?
- A.2
- B.3
- C.1
- D.7
Answer: A. 2
fluorine is 2,7; the shell just inside the outermost (the first shell) holds 2 electrons.
Q3. Reviewing for boards, a candidate picks the element oxygen. For the ion O2- produced from oxygen, what is the final electron arrangement?
- A.2,8
- B.2,8,8
- C.2,7
- D.2,6
Answer: A. 2,8
oxygen (Z = 8) is 2,6. Forming O2- means it gains 2 electrons, leaving 2,8.
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