The meaning of this subscript is the base of a specific logarithm; example: log10, the usual logarithm with the base 10.
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A log with a subscript typically indicates the base of the logarithm. For example, "log₃(x)" means the logarithm of x in base 3. This notation is used to specify the base of the logarithm function.
The subscript is the number of atoms.Example: U3O8Uranium octoxide has 3 uranium atoms and 8 oxygen atoms.
There is one atom of that element in the molecule.
Yes. In the chemical formula H2O, the subscript 2 after the hydrogen means there are two hydrogen atoms in a molecule of water. The absence of a subscript after the oxygen means the subscript is understood to be 1, so there is one atom of oxygen in a water molecule.
Not every chemical formula requires subscript. For example table salt is NaCl, sodium chloride. No subscript. But most chemical formulae do require subscript, such as water, H2O.
The superscript for platinum is Pt2+ and the subscript for platinum is Pt.