How to Calculate Mass Defect
Determine how many protons and neutrons are found in the isotope in question., Calculate the total theoretical mass of the nucleus., Subtract the experimental mass of the neutron from the theoretical mass.
Step-by-Step Guide
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Step 1: Determine how many protons and neutrons are found in the isotope in question.
Use a periodic table and remember that certain isotopes of an element may have a different number of neutrons. -
Step 2: Calculate the total theoretical mass of the nucleus.
Multiply the amount of protons by its mass in atomic mass units (approximately
1.007276u) and add it to the amount of neutrons multiplied by its mass (approximately
1.008665u).
Note that your teacher may provide you a specific value to use for these masses, or specify how many significant digits you are required to use. , This difference is the mass defect! You can convert it to kilograms and use Einstein's E=mc^2 to calculate the binding energy required to hold the nucleus together. -
Step 3: Subtract the experimental mass of the neutron from the theoretical mass.
Detailed Guide
Use a periodic table and remember that certain isotopes of an element may have a different number of neutrons.
Multiply the amount of protons by its mass in atomic mass units (approximately
1.007276u) and add it to the amount of neutrons multiplied by its mass (approximately
1.008665u).
Note that your teacher may provide you a specific value to use for these masses, or specify how many significant digits you are required to use. , This difference is the mass defect! You can convert it to kilograms and use Einstein's E=mc^2 to calculate the binding energy required to hold the nucleus together.
About the Author
Justin Anderson
Justin Anderson has dedicated 10 years to mastering lifestyle and practical guides. As a content creator, Justin focuses on providing actionable tips and step-by-step guides.
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