Water is a polar molecule. Oxygen is very electro-negative, meaning it pulls electrons close to it whenever it can. This means that the electrons in H2O spend most of their time near the oxygen atom, creating a positive charge near the Hydrogen atoms and a negative charge near the Oxygen.
This is what gives water many of its unique properties. Water molecules will attract one another and create weak hydrogen bonds. Those bonds are strong enough to pull the molecules close enough together that they condense into a liquid at room temperature.
Other atoms/molecules of similar molecular weights don’t have this property, so they don’t condense at room temperature.
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