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24 April, 16:05

Calculate the mass defect for beryllium-9, the only isotope of beryllium. The mass of beryllium-9 is 9.012182 amu. The mass of a proton (p11) is 1.00728 amu; the mass of a neutron (n01) is1.00866 amu, and the mass of an electron (e10) is0.00055 amu.

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  1. 24 April, 17:35
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    Mass defect = - 0.060238 amu

    Explanation:

    To calculate the mass defect:

    1. add up the masses of each proton and of each neutron that make up the nucleus,

    Berylium 9 has;

    4 protons = 4 * 1.00728 amu = 4.02912 amu

    5 Neutrons = 5 * 1.00866 amu = 5.0433 amu

    Sum = 9.07242 amu

    2. subtract the actual mass of the nucleus from the combined mass of the components to obtain the mass defect.

    Mass defect = Actual Mass - Combined mass

    Mass defect = 9.012182 amu - 9.07242 amu

    Mass defect = - 0.060238 amu
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