The first two formulas are correct chemical formulas for Argon, Methane, Carbon Dioxide, while the third formula is not valid as it is incorrect. Ar stands for Argon and CO2 stands for Carbon Dioxide. Methane is CH4.
The first two formulas are correct chemical formulas for Argon, Methane, Carbon Dioxide, while the third formula is not valid as it is incorrect. Ar stands for Argon and CO2 stands for Carbon Dioxide. Methane is CH4.