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What does an atomic number tell you about an atom?

The atomic number represents the number of protons present in the nucleus of an atom. The atomic number of an element is located on the upper-left corner of that element in the periodic table.

What does atomic number tell you?

The atomic number of an atom tells you an element's identity, and informs you of how many protons are present in the nucleus of the atom. For example; Potassium is an element with the symbol "K" on the periodic table that belongs in the Alkali Metal group, and has an atomic number of 19.

What does an atomic number determine?

Atomic Number. The atomic number is equal to the number of protons in an atom's nucleus. The atomic number determines which element an atom is. For example, any atom that contains exactly 47 protons in its nucleus is an atom of silver.

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