Question

what letter represents a noble gas

Explanation:

Noble gases are in Group 18 of the periodic - table. In a typical periodic - table layout, the position corresponding to Group 18 is where noble gases are located. Based on the general layout of the periodic - table, the element in the far - right column is a noble gas. In this grid, 'a' is likely in the position corresponding to Group 18.

Answer:

A. a