If M (A; Z), Mp and Mn denote the masses of the nucleus

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If M (A; Z), M_p and M_n denote the masses of the nucleus _ZX^A proton and neutron respectively in units of u ( 1u = 931.5 MeV/c²) and BE represents its bonding energy in MeV, then

1. M (A, Z) = ZM_p + (A – Z) M_n –BE/c²
2. M (A, Z) = ZM_p + ( A–Z) M_n + BE
3. M (A, Z) = ZM_p + (A – Z) M_n – BE
4. M (A, Z) = ZM_p + (A – Z)M_n + BE/c²

Correct Option: A

Mass defect = ZM_p + (A –Z)M_n–M(A,Z)

or,	B.E
	c²

= ZM_p + (A–Z) M_n–M(A,Z)

∴ M (A, Z) = ZM_p + (A–Z)M_n –	B.E
	c²