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Which of the following is equal to the atomic number of a chemical element?

A Number of protons

The atomic number of an element is a unique identifier that indicates the number of protons found in the nucleus of an atom of that element. In an uncharged atom, the atomic number is also equal to the number of electrons. This makes sense because protons are positively charged and electrons are negatively charged—having the same number of protons and electrons gives an overall, uncharged atom.

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