what is meant by periodic table
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a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.
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The periodic table is a tabular column consisting of rows and periods and this was first made by Henry Moseley. This table is a list of all the man made and naturally occurring elements
There are 7 periods and 18 groups in total
The groups are arranged in such a way that the elements in the group exhibit similar chemical properties and valency.
The periods are arranged in such a way that all the elements belonging to one group have the same number of shells
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