**Ionic Bond**

An ionic bond is formed when there is a complete transfer of electrons from one atom to another. This results in the formation of oppositely charged ions, which are held together by electrostatic forces of attraction. In the case of two atoms of chlorine (Cl), it is highly unlikely for an ionic bond to be formed. Chlorine is a nonmetal, and nonmetals tend to form covalent bonds by sharing electrons.

**Covalent Bond**

A covalent bond is formed when two atoms share electrons in order to achieve a stable electron configuration. In the case of two chlorine atoms, each chlorine atom has seven valence electrons in its outermost shell. By sharing one electron with each other, both atoms can achieve a stable configuration with eight electrons in their outer shells. This sharing of electrons is characteristic of a covalent bond.

**Electrovalent Bond**

The term "electrovalent bond" is often used interchangeably with ionic bond. It refers to the bond formed between ions of opposite charges. Since chlorine does not readily form ions, an electrovalent bond is unlikely to occur between two chlorine atoms.

**Coordinate Bond**

A coordinate bond, also known as a dative bond, is formed when one atom donates a pair of electrons to another atom. This type of bond is often seen when one atom has a lone pair of electrons that can be shared with another atom. In the case of two chlorine atoms, both atoms have the same electronegativity and do not possess any lone pairs of electrons. Therefore, a coordinate bond is not formed between two chlorine atoms.

In conclusion, the bond formed between two atoms of chlorine (Cl) is a covalent bond. The two chlorine atoms share electrons to achieve a stable electron configuration, resulting in the formation of a covalent bond.

Heteroatoms form ionic while honoatomic species form covalent bond always because there is sharing of electrons between them