Atomic Mass Calculator
Calculate the total mass of an isotope based on its constituent protons, neutrons, and nuclear binding energy.
Calculation Parameters
Specify your chemical inputs.
Calculated Result
Expert Tip
Double check molecular weights and balance equations to ensure stoichiometric ratios are correct.
How this Calculator Works
This calculator allows you to solve Atomic Mass problems dynamically. Adjust the input parameters using the sliders or selection menu below:
- Protons (Z) (Range: 1 to 92, Default: 6)
- Neutrons (N) (Range: 0 to 146, Default: 6)
- Nuclear Binding Energy (Eb, MeV) (Range: 0 to 1800, Default: 92.1)
The results are computed instantly and updated in the results panel on the right.
Formula & Methodology
Where:
- Protons: Parameter value.
- Neutrons: Parameter value.
- Nuclear Binding Energy: Parameter value.
Step-by-Step Calculation Example
To calculate Atomic Mass manually, follow these steps:
- Identify the input parameters. For example:
- Protons (Z) = 6
- Neutrons (N) = 6
- Nuclear Binding Energy (Eb, MeV) = 92.1
- Apply the formula:
Mass = (Z*mp + N*mn + Z*me) - (Eb / 931.494)
- Verify the calculated value which is updated instantly in the results panel on the right.
Frequently Asked Questions
What is atomic mass? ▼
Atomic mass is the mass of an atom expressed in atomic mass units (amu), accounting for protons, neutrons, and binding energy.
What is the difference between mass number and atomic mass? ▼
Mass number is an integer (sum of protons and neutrons), whereas atomic mass is an exact decimal value measured in amu.
How is 1 amu defined? ▼
One atomic mass unit (amu) is defined as exactly 1/12th the mass of a carbon-12 atom.