The third building block of matter is a molecule :a combination of two or more atoms of the same or different elements held together by chemical bonds.Molecules are the
basic units of some compounds (called molecular compounds).Examples are shown in Figure 5 on p.s34 in Supplement 7.
Chemists use a chemical formula to show the number of each type of atom or ion in a compound.This shorthand contains the symbol for each element present and uses subscripts to represent the number of atoms or ions of each element in the compound's and their formulas encountered in this book are sodium chloride(NaCl)and
water(H2O'read as "H-two-O").These and other compounds important to our study of environmental science are listed in Table 2-3.
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