Answer: The two elements present are nitrogen and oxygen.
Step-by-step explanation:
The chemical name for laughing gas is dinitrogen oxide and the chemical formula for this gas is

This gas is made from two elements that have chemically combined. The two elements are nitrogen and oxygen.
In 1 mole of laughing gas, 2 moles of nitrogen atoms and 1 mole of oxygen atom is present.
Hence, the correct answer is nitrogen and oxygen.