Question

$M_n$ and $M_p$ represent the mass of neutron and proton respectively. An element having mass $M$ has $N$ neutrons and $Z$ protons, then the correct relation will be

• A. $M < \{N.M_n+Z.M_p\}$
• B. $M > \{N.M_n+Z.M_p\}$
• C. $M = \{N.M_n+Z.M_p\}$
• D. $M = N\{M_n+.M_p\}$

Answer 1

Answer: (A)

When a nucleus is formed, then the mass of nucleus is slightly less than the sum of mass of Z protons and N neutrons.
i.e. , M < $\{N.M_n+Z.M_p\}$