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  • Li nucleus has three protons and four neutrons. Mass of Li nucleus is 7.016005 amu, mass of proton is 1.007277 amu and mass of neutron is 1.008665 amu. Mass defect of lithium nucleus in amu

Li nucleus has three protons and four neutrons. Mass of Li nucleus is 7.016005 amu, mass of proton is 1.007277
amu and mass of neutron is 1.008665 amu. Mass defect of lithium nucleus in amu is:

Option: 1

0.04048 amu


Option: 2

0.04050 amu 


Option: 3

0.04052 amu


Option: 4

0.04055 amu


Answers (1)

best_answer

\text { Here } \mathrm{m}_{\mathrm{p}}=1.007277 \mathrm{amu}

\mathrm{m}_{\mathrm{n}}=1.008665\, \mathrm{amu}

\mathrm{m}_{\mathrm{Li}}=7.016005 \, \mathrm{amu}

Sum of the masses of three protons and four neutrons

=3 m_p+4 m_n

\begin{aligned} & =3 \times 1.007277+4 \times 1.008665 \\ & =3.021831+4.03466=7.056491 \mathrm{amu} \\ & \therefore \quad \text { Mass defect }=7.056491-7.016005=0.040486 \, \mathrm{amu} \end{aligned}

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