Electronic ConfigurationPractice Questions & MCQs
Practice Electronic Configuration questions from Atomic Foundations of Matter (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.
Electronic ConfigurationQuiz - Solve & Score
Q1. An atom with configuration 2, 8, 7 has how many valence (outermost) electrons?
- A.7
- B.2
- C.8
- D.17
Answer: A. 7
Q2. Why does an atom with configuration 2, 8, 1 readily form a +1 ion?
- A.losing its single outer electron gives a stable octet below
- B.gaining 7 electrons is easier
- C.it cannot form ions
- D.it gains one electron to become +1
Answer: A. losing its single outer electron gives a stable octet below
Q3. Why is the outermost shell limited to 8 electrons even though M can hold 18?
- A.the Bohr-Bury rule caps the outermost shell at 8 for stability
- B.the M shell can never hold more than 8
- C.electrons cannot enter the M shell
- D.8 is the 2n^2 value for M
Answer: A. the Bohr-Bury rule caps the outermost shell at 8 for stability
Given 8, 18, asked for the unknown. By hence the result = the Bohr-Bury rule caps the outermost shell at 8 for stability. hence the result = the Bohr-Bury rule caps the outermost shell at 8 for stability. write the electron configuration 2, 8, 8. Therefore option A) the Bohr-Bury rule caps the outermost shell at 8 for stability. Others fail: option B) 'the M shell can never hold more than 8' fails since M can hold 18 when it is not the outermost shell; the cap is only for the outermost position; option C) 'electrons cannot enter the M shell' is wrong because Electrons do enter M; the cap applies when it is the outermost.
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Where can I practise Electronic Configuration questions for Class 9 Science?
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Are these Electronic Configuration questions important for the exam?
Yes. These Electronic Configuration important questions follow the Science exam pattern (CBSE Boards, plus JEE and NEET foundation), so they help with both school and competitive prep.
Do the Electronic Configuration questions come with answers and solutions?
Every Electronic Configuration question on RankByte comes with the correct answer and a full step-by-step solution, so you learn the concept instead of just guessing.