![]() Usually, each row, or period, has the metal elements on the left, while the non-metals are on the right. The rows are known as periods and the columns are known as groups. Similar atomic numbers mean that the elements have similar atomic structure, thus similar chemical properties. Printable Periodic Table with Atomic Mass and ValencyĪ table where all the elements in existence are arranged together in rows, in order of their atomic numbers is called the periodic table.
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