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ICSE Class 9 Chemistry Question 32 of 39

Atomic Structure and Chemical Bonding — Question 21

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21
Question

Question 2(iii)

Assertion (A): Isotopes of an element have similar chemical properties.

Reason (R): Isotopes of an element have the same atomic number.

  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 — Isotopes have the same atomic number (Z), i.e., the same number of electrons and protons and hence the same electronic configuration. Chemical properties are determined by the electronic configuration of an atom. Thus, isotopes of an element are chemically alike. Hence both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).