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Chemical Bonds Section 1 - Stability in Bonding Matter made up of tiny particles called atoms can exist in the form of elements and compounds Copper, iron, and lead are elements that can exist by themselves. Element simplest form of a substance and is made of only one kind of atom. can combine with other elements in a chemical reaction to form compounds. Compounds produce new and different substances have more than one kind of atom chemically joined can have different properties from the elements that form them. Compounds Example: Sodium – metal that reacts violently with water Chlorine – poisonous gas Together they form a stable compound – salt NaCl Chemical Formula tells what elements are in a compound and how many atoms of each element are in one unit of the compound NaCl - one atom of sodium and one atom of chlorine Chemical Bonding the force that holds atoms together in a compound Atomic Stability: Opposite electric forces (protons and electrons) attract each other. These forces pull atoms together to form compounds An atom is chemically stable when it has a complete outer energy level Atomic Stability: An atom that does not have a stable outer energy level can do one of three things to complete their outer level. They can gain electrons, lose electrons, or share electrons to make a full outer level. Atoms will combine with other atoms that also do not have complete outer shells. In this way, each atom becomes more stable.