MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
In an atom, electrons:
- i. move in circular orbits
- ii. move in elliptical orbits
- iii. feel a centripetal force
Think it through first, then pick an option.
- a i and ii
- b i and iii
- c ii and iii
- d i, ii and iii
Answer and explanation
Correct answer: d i, ii and iii
Circular orbits (Bohr), elliptical ones (proved later) and a centripetal pull (Rutherford): all three are true.
Why the other options are wrong
- a i and ii: iii is also true: the electron feels a centripetal pull towards the positive nucleus.
- b i and iii: ii is also true: it was later proved that electrons also move in elliptical paths.
- c ii and iii: i is also true: in Bohr's model electrons move in circular orbits.
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