Respuesta :

The superscript 4 is the atomic mass for helium, and the subscript 2 is the atomic number for helium.
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the given symbol is

⁴₂He

subscript for the element is the atomic number of the element

atomic number is the number of protons . atomic number is characteristic for the element

superscript is the mass number. mass number is the sum of protons and neutrons. mass number means the atomic mass.

therefore atomic number is 2 and mass number is 4

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