Note: Read the assertion and reason carefully and then mark the correct option out of the options given below: Assertion (A) : Moseley showed that atomic number is a more fundamental property than atomic mass. Reason (R) : Atoms of the same element having the same atomic number but different atomic masses are called isotopes.

Note: Read the assertion and reason carefully and then mark the correc

1.	Note: Read the assertion and reason carefully and then mark the correct option out of the options given below: Assertion (A) : Moseley showed that atomic number is a more fundamental property than atomic mass. Reason (R) : Atoms of the same element having the same atomic number but different atomic masses are called isotopes.
Answer» Both (A) and (R) are TRUE and (R ) is correct EXPLANATION of the assertion. Both (A) and (R ) are true but (R ) is explanation of the assertion. (A) is true but (R ) is false. (A) is false but (R ) is true. Answer :B