Question

i am a halogen. i am a gas at room temperature. and of those halogens that are gases, i am the heaviest of the two. who am i?
view periodic table
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nitrogen (n)
astatine (as)
fluorine (f)
bromine (br)
oxygen (o)
xenon (xe)
radon (rn)
iodine (i)
chlorine (cl)

Explanation:

1. First, identify halogens: elements in Group 17 of the periodic table. From the options, only Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I) are halogens (Astatine is mislabeled as As, it should be At, and it is a radioactive solid with uncertain state at STP).
2. Next, filter halogens that are gases at room temperature: Fluorine (F) and Chlorine (Cl) are gases; Bromine is a liquid, Iodine is a solid.
3. Finally, compare the atomic masses of the two gaseous halogens: Fluorine has an atomic mass of ~19 u, Chlorine has an atomic mass of ~35.45 u. Chlorine is the heavier of the two.

Answer:

Chlorine (Cl)