Something under the text is called subscript.
For example, H2O.
Something above the text is called superscript.
For example, 22 = 4.
That's it. Hope your doubt is clear.
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Subscript is used to make text or numbers smaller and lower, typically to denote a chemical formula or mathematical expression. Superscript is used to make text or numbers smaller and higher, often for exponents, footnotes, or citations.
The subscripts tell you how the atoms are bound together. The coefficient tells you how many atoms there are.
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To express an element in Isotope Notation, you write the element's symbol followed by its mass number as a superscript and its atomic number as a subscript. For example, carbon-14 is written as ^14_6C.
Adding a subscript "2" to the end of a chemical formula indicates the presence of two atoms of that element in the compound. Meanwhile, adding a coefficient in front of a formula, like "2CO," indicates that there are two molecules of that compound present. This means there are two separate molecules of CO, not a new compound of CO2.
Difference between collenchyma and chlorenchyma