Keyword Analysis & Research: atomic number

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What does atomic number refer to?

The atomic number of an element refers to the number of protons found in the nucleus of one of its atoms. Since that number refers to the protons, it is the same as the charge number of the nucleus.

What determines atomic number?

The number of protons in the nucleus of an atom determines its atomic number. Each element on the periodic table has a different number of protons in its nucleus and its own atomic number. For instance, the element chlorine contains 17 protons in its nucleus, so it has an atomic number of 17.

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