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If m, mn and mp are the masses of nucleus, neutron and proton respectively of ZXA nucleus, then:

If m, mn and mp are the masses of nucleus, neutron and proton respectively of ZXA nucleus, then: Correct Answer m &lt; (A-Z)m<span style="position: relative; line-height: 0; vertical-align: baseline; bottom: -0.25em;font-size:10.5px;">n</span> + Zm<span style="position: relative; line-height: 0; vertical-align: baseline; bottom: -0.25em;font-size:10.5px;">p</span>

CONCEPT:

Mass defect:

  • The actual mass of the nucleus is less than the sum of individual masses of the constituent neutrons and protons because energy is ejected when the nucleus is created.
  • This energy consists of mass which is ejected from the total mass of the original components of the nucleus is called a mass defect.

​EXPLANATION:

In the element ZXA,

⇒ Z = number of protons

⇒ A = mass number of element

So,

⇒ A - Z = number of neutrons

  • The actual mass of the nucleus is less than the sum of individual masses of the constituent neutrons and protons because energy is ejected when the nucleus is created.

So,

⇒ m < (A-Z)mn + ZmP

  • Hence, option 2 is correct.

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