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Helium element information from the periodic table, highlighting atomic number and mass.

A diagram showing the periodic table entry for helium (He), including its atomic number 2, atomic mass 4.0026, and the word "Helium," with text above reading "atoms of the same have different number" and "NEUTRONS" at the top.

A diagram showing the periodic table entry for helium (He), including its atomic number 2, atomic mass 4.0026, and the word "Helium," with text above reading "atoms of the same have different number" and "NEUTRONS" at the top.

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