Yes. There are isotopes of elements that are simply not found anywhere in the universe (and even if they did exist momentarily, their lifetime is so short that in the next moment they would have decayed into a different more stable isotope).
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The amount or quantity.
It is equal to exactly 110.
Y
A micrometer is equal to exactly 1 micrometer.
If you mean "Does the sum of two angles equal exactly 90 degrees?" it is yes.