A compound consists of atoms of two or more elements combined in a small, whole-number ratio.Atoms of one element differ in properties from atoms of all other elements.(credit: modification of work by “slgckgc”/Flickr) A macroscopic sample of an element contains an incredibly large number of atoms, all of which have identical chemical properties.įigure 2.2 A pre-1982 copper penny (left) contains approximately 3 × × 10 22 copper atoms (several dozen are represented as brown spheres at the right), each of which has the same chemical properties. An element consists of only one type of atom, which has a mass that is characteristic of the element and is the same for all atoms of that element ( Figure 2.2).An atom is the smallest unit of an element that can participate in a chemical change.
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