$M_n$ $and$ ${M_P}_{}$ represent the mass of the neutron and proton respectively. An element having mass M has N neutrons and Z-protons, then the correct relation will be: 

1. $M$ $<$ $\{N.M_n$ $+$ $Z.M_P\}$ 

2. $M$ $>$ $\{N.M_n$ $+$ $Z.M_P\}$

3. $M$ $=$ $\{N.M_n$ $+$ $Z.M_P\}$

4. $M$ $=N\{M_n$ $+$ $M_P\}$

The mass of a proton is 1.0073 u and that of a neutron is 1.0087 u (u = atomic mass unit). The binding energy of ${}_2{}^4\mathrm{He}$ is: (Given: helium nucleus mass ≈ 4.0015 u)

The mass number of a nucleus is:

If in a nuclear fusion process. the masses of the fusing nuclei be \(m_1\) and \(m_2\) and the mass of the resultant nucleus be \(m_3,\) then:

A nucleus represented by the symbol ${}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{X}$ has:

M_P denotes the mass of a proton and M_n that of a neutron. A given nucleus, of binding energy B, contains Z protons and N neutrons. The mass M(N, Z) of the nucleus is given by:
(c is the velocity of light )

1. M(N, Z) = NM_n + ZM_P + Bc²

2. M(N, Z) = NM_n + ZM_P – B/c²

3. M(N, Z) = NM_n + ZM_P + B/c²

4. M(N, Z) = NM_n + ZM_P – Bc²