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27 July, 07:51

What is the mass defect of lithium-7? Assume the following: Atomic number of lithium = 3 Atomic mass of lithium = 7.016003 atomic mass units. Mass of 1 proton = 1.007276 atomic mass units. Mass of 1 neutron = 1.008665 atomic mass units

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  1. 27 July, 09:40
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    Mass defect is the difference of the mass of the constituent particles (protons and neutrons) of the actual mass of the nucleus. The mass of a nucleus is actually less than the mass of the protons and neutrons.

    This is how you calculate it for this problem.

    lithium - 7 = > 3 protons and 4 neutrons

    mass of 3 protons = 3 * 1.007276 amu = 3.021828 amu

    mass of 4 neutrons = 4 * 1.008665 amu = 4.03466

    => mass of 3 protons + 4 neutrons = 3.021828 amu + 4.03466 amu = 7.056488

    Mass defect = mass of 3 protons and 4 neutrons - atomic mass of lithium =

    Mass defect = 7.056488 amu - 7.016003 amu = 0.040485 amu
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