I assume you mean a set that contains a single whole number. Yes, you can have sets with zero elements, one element, two elements, etc.; so a set which contains a single number is perfectly valid.
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False
It is the maximum of that set.
No, the set of natural numbers is a proper subset of the set of whole numbers.
The is false. "the whole number" is a single number while "the set of natural numbers" is a set. A single number cannot be equal to a set.
The set of rational numbers is the union of the set of fractional numbers and the set of whole numbers.