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ICSE Class 10 Chemistry Question 10 of 25

Periodic Table, Periodic Properties and Variations of Properties — Question 22

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Question

Question 22

Assertion (A): Elements in the same vertical column have similar properties.

Reason (R): Properties depend upon the number of electrons in the valence shell.

  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and R are true but R is not the correct explanation of A.
  3. A is true but R is false.
  4. A is false but R is true.
Answer

Both A and R are true and R is the correct explanation of A.

Explanation — Elements in the same vertical column i.e., a group in the periodic table, have the same number of valence electrons. Since chemical properties of elements depend upon the number of valence electrons, thus elements in the same group have similar properties. Hence, Reason (R) correctly explains the Assertion (A).