An atom of argon rarely bonds to an atom of another element because an argon atom has

The answer to your question is below: 8 electron in its outer most shell.

Explanation:

Argon like noble gases are stable elements that means that they do not react with other elements. They have eight electrons in their outermost shell; Elements are stable when they reach 8 electronsin their outer most shell, some elements reach 8 electrons receiving from others (nonmetals) and others donate electrons (metals).