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Covalent/Ionic Bonds 7.P.2A.4 Construct explanations for how compounds are classified as ionic (metal bonded to nonmetal) or covalent (nonmetals bonded together) using chemical formulas.

The following bullets are things that you should already know: Elements are made up of one kind of atom and the symbol for each element is unique. Compounds are composed of more than one atom chemically bonded, and their formulas show the different atoms that compose the compound.

Chemical Formula Chemical formulas use element symbols from the periodic table and numerical subscripts to depict the name and number of atoms of each element in the compound examples include: Water (H2O), Glucose(C6H12O6), and Table Salt (NaCl)

Chemical Formula • In a chemical formula, the numbers as subscripts show how many of each kind of atom are in the compound. The subscript is written to the lower right of the element symbol. If no subscript is written, only one atom of that element is part of the compound. For example, in H2O, the number 2 is the subscript for hydrogen and means that there are 2 atoms of hydrogen in the compound of water; since there is no subscript for oxygen it is assumed to be one atom of oxygen.

Chemical Formula N2, O2, F2, Cl2, Br2, I2, and H2 are diatomic molecules where all of the atoms of the molecule are the same element.

Ionic Bonds Ionic bonds are formed when metals and nonmetals chemically bond to form a new substance. In ionic bonds, electrons are transferred from the metals to the nonmetals.

Covalent bonds are formed when nonmetals bond with other nonmetals. In covalent bonds, electrons are shared.