NSES: Physical-Science: Matter Structure/Properties - 2 An element is composed of a single type of atom
2 An element is composed of a single type of atom. When elements are listed in order according to the number of protons (called the atomic number), repeating patterns of physical and chemical properties identify families of elements with similar properties. This 'Periodic Table' is a consequence of the repeating pattern of outermost electrons and their permitted energies.
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