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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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Help your mates do their homework and share Top Homework Answers with them, it’s completely free and easy to use! Which element does X represent in the following expression – 15 is the atomic number which is phosphorus. 32 would indicate which isotope of P. 15 protons, 15 electrons, 17 neutronsWhich element does X represent in the following expression 32X15? The isotope 32X (with subscript 15) is phosphorus(32P).The upper number is the atomic mass number and the lower is the atomic number.Element X is an element of Mg which is located in group 2A and period 3 with 12 = atomic number and 25 = mass number The Atomic Number (Z) indicates the number of protons in an atom of an element. If the atom is neutral then the number of protons will be equal to the number of electrons.

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