108
Carbons
There are 13 books making up Euclid's 'Elements'.
There are 13 books in Euclid's Elements.
yes
There are thirteen books in Euclid's Elements.
There are 13 books in Euclid's Elements.
13 of them.
There are 13 books in Euclid's Elements. The title of Book XIII is " Regular solids."
Two or more elements.
How many radioactive elements are made only in a laboratory?
13 of them.
There are 13 books. Book 13 is about regular solids.