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Delhi Police SI Atomic Structure and Valency — practice questions

Explore 1 free Atomic Structure and Valency 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 and Valency questions and exercises with answers

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Magnesium has atomic number 12. What is its valency?Read the answer and worked solution →

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Magnesium has atomic number 12. What is its valency?

  1. -3
  2. -2
  3. +2
  4. +3
Show answer and solution

Correct answer: C. +2

1. Electronic configuration of magnesium (Z = 12) is 2, 8, 2. 2. It has 2 electrons in its outermost shell, which it loses to attain stability. 3. Losing 2 electrons gives it a valency of +2. _Source: RRB Group D CEN-02/2018 PYQ, Q.51._

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