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The two major types of bonds are and . Electrons are either or to fill the last shells of atoms that ions. The number of an ion is either positive or negative. When we combine ions we can only combine with ions. When atoms share electrons they form bonds. The electrons involved with bonding, in the last shell that are shared are called electrons. Three examples of macromolecules are , and . The four main atoms involved in carbon chemistry are .
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The two major types of bonds are and . Electrons are either or to fill the last shells of atoms t...
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