List three halogens, and describe a property
that they all share.

The halogen group are fluorine, chlorine, bromine, iodine, and astatine. The halogenic elements all have seven valence electrons; they only require one electron to fill their outer shells, giving them an oxidation number of –1. Also, the halogens form diatomic molecules (e.g., Cl₂) in their elemental states.

Additionally, the halogens act like oxidizing agents, exhibiting the ability to oxidize metals. In fact, the name halogen is derived from the Greek meaning "salt former", referencing the fact that the halogens form salts when they react with metals.

to make a supersaturated solution, make a saturated solution of sugar by adding 360 grams of sugar to 100 ml of water at 80 degrees celsius. when the water cools back down to 25 degrees, that 360 grams of sugar will still be dissolved even though the water should only dissolve 210 grams of sugar.

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.