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How to find the number of electrons in an atom?

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Part 1. Calculating Protons, Electrons, and Neutrons. Get a periodic table of elements. Find your element on the periodic table. Locate the element's atomic number. Determine the number of electrons. Look for the atomic mass of the element. Subtract the atomic number from the atomic mass. read more

Because electrons are negatively charged, when an element is in its neutral state, it will have the same number of protons as electrons. For instance, boron (B) has an atomic number of 5, meaning that it has 5 protons and 5 electrons. read more

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. read more

The easiest way to find the number of protons, neutrons, and electrons for an element is to look at the element’s atomic number on the periodic table. That number is equal to the number of protons. The number of protons is equal to the number of electrons, unless there’s an ion superscript listed after the element. read more

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