Final answer:
An ionic bond is formed when two elements bond due to equal and opposite charges, creating an electrostatic attraction between ions, such as in the formation of common table salt. Therefore, correct option is 1.
Step-by-step explanation:
When two elements bond due to equal and opposite charges, the type of bond formed is called an ionic bond. This bond is the result of the electrostatic attraction between ions with opposite charges.
For example, when a metallic atom transfers an electron to a nonmetallic atom, a positively charged cation and a negatively charged anion are created. These ions are then attracted to one another, forming the ionic bond.
Ionic bonds are essential in the formation of compounds like sodium chloride, where positively charged sodium ions (Na+) and negatively charged chloride ions (Cl-) combine to produce table salt, a crystalline molecule with a neutral overall charge.