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Questions asked by users might not always be phrased in the clearest way.
An isotope is a variation of a chemical element that has the same number of protons (atomic number) but a different number of neutrons. This difference in neutrons results in a different atomic mass.
The notation 110_x represents an isotope with an atomic mass of 110. The subscript x represents the atomic number.
To find x, we need to determine the element with an atomic number that results in an isotope with a mass of 110.
The element with an atomic number of 40 is Zirconium (Zr). However, Zirconium-110 (110_40) is not a naturally occurring isotope. It's likely you're looking for a different element or isotope.