79 and a charge of -2 thx for the points
Bromine. both Bromine and Mercury are both a liquid at STP. :)
Answer:
i think it's B sorry if i'm wrong
Each element absorbs light at specific wavelengths unique to that atom. When astronomers look at an object's spectrum, they can determine its composition based on these wavelengths. The most common method astronomers use to determine the composition of stars, planets, and other objects is spectroscopy.
hope this helps you! :-)
