![]() ![]() In a given compound, the numbers of atoms of each of its elements are always present in the same ratio (Figure 5.1b).įigure 5.1b: Macroscopic vs microscopic visual of the compound copper(II) oxide: copper(II) oxide, a powdery, black compound, results from the combination of two types of atoms-copper (brown, larger spheres) and oxygen (red, smaller spheres)-in a 1:1 ratio. 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 slgc, CC BY 2.0 in Chemistry (OpenStax), CC BY 4.0). A macroscopic sample of an element contains an incredibly large number of atoms, all of which have identical chemical propertiesįigure 5.1a: Macroscopic vs microscopic visual of the element copper: 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. ![]()
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