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Delhi Police SI Atomic Structure — practice questions

Explore 2 free Atomic Structure questions in Delhi Police SI Science. Open each question or exercise to read its content, reference answers and available explanation.

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Atomic Structure questions and exercises with answers

Showing questions 1–2 of 2.

Which element has three shells with 8 electrons in its outermost shell?Read the answer and worked solution →Atomic radius is conveniently measured in which unit?Read the answer and worked solution →

Worked practice questions

Which element has three shells with 8 electrons in its outermost shell?

  1. Xe
  2. Kr
  3. Ne
  4. Ar
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Correct answer: D. Ar

1. An element with three shells has electron arrangement 2, 8, 8. 2. Total electrons = 18, so atomic number 18. 3. Element 18 is argon (Ar). _Source: RRB Group D CEN-02/2018 PYQ, Q.43._

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Atomic radius is conveniently measured in which unit?

  1. Micrometres
  2. Millimetres
  3. Nanometres
  4. Centimetres
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Correct answer: C. Nanometres

1. Atoms are extremely small, of the order of 10⁻¹⁰ m. 2. Among the given options, the nanometre (10⁻⁹ m) is the closest practical scale. 3. Hence atomic radius is measured in nanometres. _Source: RRB Group D CEN-02/2018 PYQ, Q.82._

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