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# Atomic number and mass number

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Given the atomic number and the mass number of an atom how do we determine the number of protons in the nucleus? The number of neutrons in the nucleus? The number of electrons in the surrounding shells?

© BrainMass Inc. brainmass.com September 25, 2018, 8:47 pm ad1c9bdddf - https://brainmass.com/chemistry/stoichiometry/atomic-number-mass-number-49047

#### Solution Preview

To find the number of protons, electrons and neutrons in an atom, just follow these easy steps:
Step 1 - Gather Information
Use the Table of Elements to find your element's atomic number and atomic weight. The atomic number is the number located in the upper left corner and the atomic weight is the number located on the bottom, as in this example for krypton:

Step 2 - The Number of Protons is...
The atomic number is the number of protons in an atom of an element. In our example, krypton's atomic number is 36. This tells us that an atom of krypton has 36 protons in its nucleus.
Step 3 - The Number of ...

#### Solution Summary

The solution provides a detailed and step-by-step explanation for the problem.

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