The list that only includes terms that describe Cesium (Cs) is option (b) i.e atom, element, pure substance .
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What do you mean by the term atom , element, pure substance ?
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Atom, is the smallest unit of matter that has the characteristic properties of a chemical element .The atom is the basic building block of chemistry.
Element is a pure substance consisting of only one type of atom which all have the same numbers of protons. Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions.
Hence ,in the list that only includes terms that describe Cesium (Cs) is option (b) i.e atom, element, pure substance .
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