Hydrogen
Atomic Number (Z): 1; Mass Number (A): 1; Charge: 0
Number of Electrons: 1; Number of Neutrons: 0; Number of Protons: 1
Atom Composition Calculator
Chemistry0.0(0)
Calculates the number of protons, neutrons, and electrons in an atom based on its atomic number and mass number. Assumes a neutral atom unless the charge is specified.
More tools:Science & Lab Calculators
How To Use
How to use this calculator
Start with your values, or try a preset.
Step 1
Enter Atomic Number (Z), Mass Number (A), and Charge in the units shown.
Step 2
Read Number of Electrons, Number of Neutrons, and Number of Protons in the results panel. Results update as you change the inputs.
Step 3
Choose a preset to load an example, then adjust the values for your situation.
Worked Examples
Example calculations
See the inputs and their calculated results.
Carbon
Atomic Number (Z): 6; Mass Number (A): 12; Charge: 0
Number of Electrons: 6; Number of Neutrons: 6; Number of Protons: 6
Oxygen
Atomic Number (Z): 8; Mass Number (A): 16; Charge: 0
Number of Electrons: 8; Number of Neutrons: 8; Number of Protons: 8
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