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21 December, 17:59

How are the elements in the periodic table arranged from left to right and top to bottom based on what value?

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  1. 21 December, 19:06
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    Well, elements are arranged based on a number of factors.

    Left to right, elements are arranged based on atomic number. The atomic numbers of the elements are increasing by 1 as you move from left to right.

    Top to bottom is based on increasing atomic radius. As you move from top to bottom, each succeeding element in a group gets an additional electron shell, increasing the atomic radius as you move down.
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