Question

A(n) blank is an abbreviation for the name of an element a and usually has either one or two letters

Answer 1

Chemical symbol.

Step-by-step explanation:

A chemical symbol is a notation composed by one or two letter and refers the abbreviation of a chemical element. The three letter based symbols are the temporary elements.

Answer 2

An chemical symbol is an abbreviation for the name of an element and usually had either one or 2 letters.