Did you ever make cupcakes from scratch, like the boy pictured above? 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 different elements can join together to form entirely different substances called 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?
A chemical bond is a force of attraction between atoms or ions. Bonds form when atoms share or transfer valence electrons. Valence electrons are the electrons in the outer energy level of an atom that may be involved in chemical interactions. Valence electrons are the basis of all chemical bonds. For a video introduction to chemical bonds, go to this URL: http://www.youtube.com/watch?v=CGA8sRwqIFg&NR=1
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 common compound 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 Figure below, each hydrogen atom has just one electron, 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 Figure above, 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. You can learn more about the three types by watching this video: http://www.youtube.com/watch?v=hEFeLYWTKX0
For an entertaining song comparing covalent and ionic bonds, go to this URL: http://www.youtube.com/watch?v=BCYrNU-7SfA
- A covalent bond is the force of attraction that holds together two nonmetal atoms that share a pair of electrons. One electron is provided by each atom, and the pair of electrons is attracted to the positive nuclei of both atoms. The water molecule represented above contains covalent bonds.
- An ionic bond is the force of attraction that holds together oppositely charged ions. Ionic bonds form crystals instead of molecules. Table salt contains ionic bonds.
- A metallic bond is the force of attraction between a positive metal ion 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. Only metals, such as the copper pictured in the Figure below, form metallic bonds.
Metallic bonds explain many of the properties of metals. This coil of wire is made of the metal copper. Like other metals, copper is shiny, can be formed into wires, and conducts electricity.
- 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.
chemical bond: Force of attraction between atoms or ions that occurs when atoms share or transfer valence electrons.
Watch the video about covalent bonds at the following URL, 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?
- 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?