Ncert Exercises & Solutions

Assertion (A):	All isotopes of a given element show the same type of chemical behaviour.
Reason (R):	The chemical properties of an atom are controlled by the number of electrons in the atom.

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.

Hint Chemical property depends on the number of electrons

Atoms with the same atomic number but with different atomic masses are called isotopes. R correctly explains A because isotopes of the same element have identical electron configurations and, hence, exhibit the same chemical behavior, even though their atomic masses differ

Hence, isotopes exhibit similar chemical properties

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