Which group of atoms is the most reactive and forms both covalent and ionic bonds?

The ions in a solid ionic compound are not randomly arranged. Instead, they have a regular, repeating arrangement called an ionic lattice . The lattice is formed because the ions attract each other and form a regular pattern with oppositely charged ions next to each other.What can you conclude about the strength of ionic bonds based on the physical properties of ionic compounds?  The electrons present in the outer energy levels of the bonding metallic atoms are not held by any specific atom and can move easily from one atom to the next.

Explanation: