1.

Assertion : Mass number of an atom is equal to total number of nucleons present in the nucleus Reason :Mass number defines the identity of an atom

Answer»

If both assertion and reason are true and the reason is the CORRECT explanation of the assertion
If both assertion and reason are true but reason is not the correct EXPLANANTION of the assertion
If assertion is true but reason is false
If the assertion and reason both are false

Solution :Atominc number of PROTONS in its NUCLEUS


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