(credit: modification of work by “Chemicalinterest”/Wikimedia Commons) In a given compound, the numbers of atoms of each of its elements are always present in the same ratio ( Figure 2.3).įigure 2.3 Copper(II) oxide, a powdery, black compound, results from the combination of two types of atoms-copper (brown spheres) and oxygen (red spheres)-in a 1:1 ratio.
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