Which of the Following Elements or Compounds Is Most Likely

Multiple Choice

Which of the following elements or compounds is most likely to be a gas at room temperature?

A) a metal such as sodium (Na)
B) an alloy of two metals such as bronze, which is a mixture of copper (Cu) and tin (Sn)
C) a salt such as MgO
D) a nonmetal such as chlorine (Cl₂)
E) none of these elements or compounds will be a gas at room temperature