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Have you ever made cupcakes from scratch?
You mix together flour, sugar, eggs, and other ingredients to make the batter, put the batter into cupcake papers, and then put them into the oven to bake. The cupcakes that come out of the oven after baking are different from any of the individual ingredients that went into the batter. Like the ingredients that join together to make cupcakes, atoms of differentelementscan join together to form entirely differentsubstancescalled compounds. In cupcakes, the eggs and other wet ingredients cause the dry ingredients to stick together. What causes elements to stick together in compounds? The answer is chemical bonds.
What Is a Chemical Bond?
Achemical bondis a force of attraction between atoms orions. Bonds form when atoms share or transfervalenceelectrons. Valence electrons are the electrons in the outerenergylevel of an atom that may be involved in chemical interactions. Valence electrons are the basis of all chemical bonds.
Q:Why do you think that chemical bonds form?
A:Chemical bonds form because they give atoms a more stable arrangement of electrons.
Why Bonds Form
To understand why chemical bonds form, consider the commoncompound(opens in new window)known as water, or H2O. It consists of two hydrogen (H) atoms and one oxygen (O) atom. As you can see in the on the left side of the figurebelow, each hydrogen atom has just oneelectron, which is also its sole valence electron. The oxygen atom has six valence electrons. These are the electrons in the outer energy level of the oxygen atom.
In the water molecule on the right in the figureabove, each hydrogen atom shares a pair of electrons with the oxygen atom. By sharing electrons, each atom has electrons available to fill its sole or outer energy level. The hydrogen atoms each have a pair of shared electrons, so their first and only energy level is full. The oxygen atom has a total of eight valence electrons, so its outer energy level is full. A full outer energy level is the most stable possible arrangement of electrons. It explains why elements form chemical bonds with each other.
Types of Chemical Bonds
Not all chemical bonds form in the same way as the bonds in water. There are actually three different types of chemical bonds, called covalent, ionic, and metallic bonds. Each type of bond is described below.
- Acovalentbondis the force of attraction that holds together twononmetalatoms that share a pair of electrons. One electron is provided by each atom, and the pair of electrons is attracted to the positivenucleiof both atoms. The water molecule represented in Figure \(\PageIndex{2}\) contains covalent bonds.
- Anionicbondis the force of attraction that holds together oppositely charged ions. Ionic bonds form crystals instead of molecules. Tablesaltcontains ionic bonds.
- Ametallicbondis the force of attraction between a positivemetalion and the valence electrons that surround it—both its own valence electrons and those of other ions of the same metal. The ions and electrons form a lattice-like structure. Onlymetals, such as the copper pictured in Figure \(\PageIndex{3}\),form metallic bonds.
Summary
- A chemical bond is a force of attraction between atoms or ions. Bonds form when atoms share or transfer valence electrons.
- Atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons.
- There are three different types of chemical bonds: covalent, ionic, and metallic bonds.
Review
- What is a chemical bond?
- Explain why hydrogen and oxygen atoms are more stable when they form bonds in a water molecule.
- How do ionic bonds and covalent bonds differ?
Explore More
Watch this video about covalent bonds, and then answer the questions below.
- Which types of elements can form covalent bonds?
- How can you tell the number of covalent bonds an element can form?
- Why does one atom of nitrogen form bonds with three atoms of hydrogen?
