Answer is: Fluorine and chlorine, because they are both halogens.
Halogen elements are in group 17: fluorine (F), chlorine (Cl), bromine (Br) and iodine (I). They are very reactive and easily form many compounds.
In the gaseous state halogens form diatomic covalent molecules.
Halogen diatomic molecules (halogen means "salt producing") in the gaseous state in room temperature are fluorine (F₂) and chlorine (Cl₂).
Both molecules have single covalent bond and they are very reactive.
Halogens need to gain one electron to have electron cofiguration like next to it noble gas. For example, fluorine has 9 electrons and it gain easily one electron in chemical reaction to have electron configuration like noble gas neon (Ne) with 10 electrons.
I believe that the best answer to the choices given in your question are:
2.They have the same or similar properties as the materials used to make them.<span>1.They’re made up of more than one substance.</span>
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Chemical equations give information in two major areas. First, they tell us what substances are reacting (those being used up) and what substances are products (those being made). Second, the coefficients of a balanced equation tell us in what ratio the substances react or are produced.
