Atoms are important because they form the basic building blocks of all visible matter in the universe. There are 92 types of atoms that exist in nature, and other types of atoms can be made in the lab. The different type... More »

Metals are the only substances that use metallic bonds among their atoms. While many elements are commonly known as metals, including iron, aluminum, gold, silver and nickel, metals include a variety of other elements as... More »

The three main types of atomic bonds are ionic, covalent, and metallic. Each type of bond involves valence electrons but in different ways, such as sharing or donating. Other types of atomic bonds involve a more specific... More » Science Chemistry Atoms & Molecules

Carbon atoms are the building blocks for carbon, which is the sixth most abundant element found in the universe. A carbon atom has six electrons, four of which are in the outer shell of the atom, its valence shell. More »

Atoms and molecules both make up matter in the universe, but atoms make up molecules. In order to form molecules, atoms form bonds. More » Science Chemistry Atoms & Molecules

Aristotle's contribution to the understanding of atoms was to help dispel the commonly held belief of his time that the indivisible building blocks of matter were uniform in nature and had no unique or characteristic pro... More »

Atoms are the basic building blocks of matter. When two or more atoms join together, they form molecules. An example would be two hydrogen atoms and an oxygen atom joining to form a water molecule. More »