A. F2
B. Cl2
C. Br2
D. I2
E. H2

I know all the choices above are non-metal. But how can I deduce which one is liquid at room temperature. Is there a trend that I can use to figure out which one is liquid, solid, and gas at room temp?

Or is it something that I have to memorize?


the correct answer is Br2.

Thanks!