1.

Isotopes are atoms having the same [EAMCET 1978, 79; MP PMT 1980; CPMT 1973;  BHU 2001; AFMC 2003]

A.                 Atomic mass     
B.                 Mass number
C.                 Atomic number
D.                 Number of neutrons
Answer» D.                 Number of neutrons


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