The atomic mass of the lithium-7 atom is 7.016003 amu. The mass of a proton is 1.007277 amu and the mass of a neutr…
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Question “The atomic mass of the lithium-7 atom is 7.016003 amu. The mass of a proton is 1.007277 amu and the mass of a neutr…”
Answer
Mass defect refers to the difference in the mass of an individual particle and the mass atom. The following formula can be used to calculate it:
m = Z(mp+me) + (A-Z)mn + Matom
Here, Z is the atomic number, m is mass defect, m is mass neutron, and m atomis mass of the atom.
(1)
Lithium
Atomic mass Lithium A = 7.16003 amu
Number of protons = 3.
Number of neutrons = 7-3
=4
mass defect = Z(mp + me) + (A -Z)mn – Matom
= [3(1.007826 amu] + (7-3)1.008665 pmu] – 7.16003 amu
mass defect m = 0.0421335 amu
thus mass defect for lithium = 0.041335 amu
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