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Question Video: Identifying the Type of Covalent Bond in a Given Dot and Cross Diagram Science

What type of covalent bond is indicated by the 4 electrons, shown in green, in the center of the molecule?

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Video Transcript

What type of covalent bond is indicated by the four electrons, shown in green, in the center of the molecule? (A) A single covalent bond, (B) a double covalent bond, or (C) a triple covalent bond.

Covalent bonds are chemical bonds that are formed when two nonmetal atoms share one or more pairs of electrons. This definition tells us that at least one pair of electrons is required to make a covalent bond. Since one pair of electrons is the minimum requirement for a bond, a bond with one pair of electrons is a single bond. Generally speaking, each atom will donate one electron to form the bond.

We can see from the diagram that there are four electrons involved in the oxygen–oxygen bond. Two of them are represented as dots, and two are represented as crosses. The electrons in one oxygen atom are represented by crosses, and the electrons in the other oxygen atom are represented by dots. So, in this example, each atom has donated two electrons. So there are two pairs of electrons, thus four electrons in total. We call this a double bond. If three pairs of electrons, totaling six electrons, were involved, then this would be a triple bond.

Since we have four electrons that are being shared by two atoms, the type of bond is (B), a double covalent bond.

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