The bond formed between two atoms of an electronegative element is:
There are three main types of chemical bonds: electrovalent (ionic), covalent, and coordinate. Among these options, the correct answer is Covalent. Here is a detailed explanation of each type of bond:
1. Electrovalent (Ionic) Bond:
- This bond is formed between a metal and a non-metal.
- It involves the transfer of electrons from one atom to another.
- The metal atom loses electrons to become a positively charged ion (cation), while the non-metal atom gains electrons to become a negatively charged ion (anion).
- The resulting oppositely charged ions are held together by electrostatic forces of attraction.
- Example: Sodium chloride (NaCl) - sodium donates an electron to chlorine.
2. Covalent Bond:
- This bond is formed between two non-metal atoms.
- It involves the sharing of electrons between the atoms to achieve a stable electron configuration.
- Both atoms contribute one or more electrons to form a shared pair or multiple shared pairs of electrons.
- The shared electrons are attracted to the nuclei of both atoms, forming a strong bond.
- Example: Hydrogen molecule (H2) - both hydrogen atoms share a pair of electrons.
3. Coordinate (Dative Covalent) Bond:
- This bond is a special type of covalent bond.
- It occurs when one atom donates a lone pair of electrons to another atom that needs them to complete its valence shell.
- The atom donating the lone pair of electrons is called the donor, while the atom accepting the electrons is called the acceptor.
- The shared electron pair is contributed entirely by the donor atom.
- Example: Formation of the ammonium ion (NH4+) - the nitrogen atom donates a lone pair of electrons to a hydrogen ion (H+).
In conclusion, the bond formed between two atoms of an electronegative element is covalent. This type of bond involves the sharing of electrons between two non-metal atoms to achieve a stable electron configuration.

Covalent Bond:
A covalent bond is a type of chemical bond that occurs when two atoms share electrons. It is formed between two nonmetals or between a nonmetal and a metalloid. In a covalent bond, the atoms involved have similar electronegativities, meaning they have a similar ability to attract electrons.

Electronegativity:
Electronegativity is a measure of an atom's tendency to attract electrons towards itself in a chemical bond. It is a property that helps determine the type of bond formed between atoms. The higher the electronegativity difference between two atoms, the more likely it is that an ionic bond will form. On the other hand, if the electronegativity difference is low, a covalent bond is more likely to be formed.

Electronegative Elements:
Electronegative elements are those that have a high tendency to attract electrons towards themselves. These elements are usually found on the right side of the periodic table and include elements such as oxygen, nitrogen, fluorine, chlorine, etc. These elements have high electronegativities and form covalent bonds with other elements.

Bond between Electronegative Elements:
When two atoms of an electronegative element come together to form a bond, they share electrons. This sharing of electrons allows both atoms to achieve a more stable electron configuration, similar to that of a noble gas. Since both atoms have similar electronegativities, there is no significant difference in their ability to attract electrons.

Covalent Bond Formation:
In a covalent bond, the shared electrons are located in the outermost energy level or valence shell of the atoms involved. Each atom contributes one or more electrons to the bond, forming a shared electron pair or multiple shared electron pairs. This sharing of electrons creates a bond that holds the atoms together.

Example:
For example, in the molecule H2O, two atoms of hydrogen (H) form covalent bonds with one atom of oxygen (O). Both hydrogen and oxygen are electronegative elements. Each hydrogen atom shares one electron with the oxygen atom, and the oxygen atom shares two electrons with the hydrogen atoms. This sharing of electrons results in the formation of two covalent bonds between the hydrogen and oxygen atoms, creating a stable molecule of water.

Therefore, the bond formed between two atoms of an electronegative element is covalent (option B).