Chapter 18, Problem 14RQ

To determine

The number of electrons shared in a double covalent bond.

Answer to Problem 14RQ

Four electrons are shared in a double covalent bond or Two electrons from each atom are shared in a double covalent bond.

Explanation of Solution

The atoms of the same elements or the atoms of elements having very less electronegativity difference tend to share the electrons for the bond formation. They undergo a mutual sharing of electron between them and form a typical bond called a covalent bond. Thus a covalent bond is a type of bond where atoms are held together by the mutual attraction of a shared pair of electrons.

When the two atoms tend to combine and mutually share one electron each, they make a single covalent bond. Similarly, when the two atoms tend to combine and mutually share two electrons each, they make a double covalent bond. Thus, the double covalent bond or double bond is a bond formed by the mutual sharing of four electrons between them.

Conclusion:

Therefore, total four electrons or two electrons from each atom are shared in a double covalent bond.