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Ever since the creation of the periodic tables, there has been more and more discoveries of elements. Over the past 150 years, an over a hundred new elements have been found. Just in the past 10 years there has been an addition of 4+ new elements in the periodic table. There are still many elements waiting to be discovered.

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5e2fb76501dafd7fb46ec3e6_52_Common Groups and Periods of the Periodic table copy

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In the periodic table, the arrangement of elements in a column is known as a group. Just like how every period has something in common, every group adds an additional shell to an atom. For example, from Lithium to Sodium, the number of shells goes from 2 to 3, but they still keep the same amount of electrons (1).

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Our period table is sorted in order of increasing atomic numbers going to the left. Each row on the periodic table are called periods. In each period, the number of electrons in the atom of the element increases as you go down the row. The last one in the row, which makes up group 18, having a full shell of electrons.

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The periodic table has been around for over 150 years. It was first arranged in the way it is today by Dmitri Mendeleev, also known as the 'father' of the periodic table, back in 1869. He even left gaps in places since he realized there were elements that was yet to be discovered during his time.

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Aaryashree Sapkota