1.

The nucleus of an atom is made up of X protons and Y neutrons. For the most stable and abundant nuclei [NCERT 1980]

A.                 X and Y are both even   
B.                 X and Y are both odd
C.                 X is even and Y is odd    
D.                 X is odd and Y is even
Answer» B.                 X and Y are both odd


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