Atomic Radius is just what it seems, the radius of an atom of an element. This trend increases as we move from top to bottom and right to left in the periodic table. Therefore, Helium has the smallest atomic radius and then going down a line diagonal and to the left, the radii increase in size.
Although this wasn't a major point of the notes, this concept was very interesting, to see how uniform the table lays out all the elements in such a way as to where all the sizes are so orderly.
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