Question

two pure elements react to form a compound. one element is an alkali metal, x, and the other element is a halogen, z. which of the following is the most valid scientific claim that can be made about the compound?
a it has the formula xz₂.
b it does not dissolve in water.
c it contains ionic bonds.
d it contains covalent bonds.

Explanation:

Alkali metals have a tendency to lose one electron to form a +1 cation, and halogens have a tendency to gain one electron to form a - 1 anion. When they react, they form an ionic compound through the transfer of electrons, resulting in ionic bonds. The formula of the compound formed between an alkali - metal (X) with a +1 charge and a halogen (Z) with a - 1 charge is XZ, not XZ₂. Most alkali - metal halides are soluble in water. Covalent bonds form between non - metals by sharing electrons, which is not the case here as one element is a metal and the other is a non - metal.

Answer:

C. It contains ionic bonds.