Final answer:
Ionic bonds are formed between K and Ca, Sr and Ba, C and O, and Br and I. In an ionic bond, one atom transfers electrons to another atom, resulting in the formation of positively and negatively charged ions. Elements with low electronegativity, such as metals, tend to form ionic bonds.
Step-by-step explanation:
Ionic bonds are formed between K and Ca, Sr and Ba, C and O, and Br and I.
In an ionic bond, one atom transfers electrons to another atom, resulting in the formation of positively and negatively charged ions. Elements with low electronegativity, such as metals, tend to form ionic bonds.
For example, K and Ca are both metals, and they will form ionic bonds when they react with elements like chlorine or oxygen. On the other hand, molecules like CO or Br2 involve sharing of electrons, so they form covalent bonds.