Answer:
K and Br
Step-by-step explanation:
Ionic bonds form through the transfer of electrons.
Ionic Bonds
Ionic bonds form when 2 atoms or molecules transfer electrons between each other. This transfer of electrons changes the atoms into ions. Ions are charged particles, and where ionic bonds get their name from. In an ionic bond, one atom will lose electrons and become positively charged; this particle is known as a cation. The atom that gains electrons and becomes negatively charged is known as an anion.
Identifying Ionic Bonds
One of the easiest ways to identify an ionic bond is by identifying the types of atoms that are bonding. In most cases, when a metal and nonmetal bond, an ionic bond will form. This is due to the large difference in electronegativity between metals and nonmetals. This leads to the metal being a cation and the nonmetal being an anion. Since K (potassium) is a metal and Br (bromine) is a nonmental, they will form an ionic bond.
To find metals and nonmetals we can look at the periodic table. Metals are on the left side of the table and make up the majority of the elements. Nonmetals are on the right side of the table.