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## Which Element Does X Represent In The Following Expression: 2512X?

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## Question

Which element does X represent in the following expression: 2512X?

## Answer

I bet this is the notation used in nuclear reactions. The superscript represents the mass number while the subscript represents the atomic number of the element X. So, we find the element with an atomic number of 12. That would be Magnesium or Mg.

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