The rows (called periods) of the periodic table and the columns (called groups) are actually groupings of atoms with similar properties. The atomic number increases as you move from left to right across the table.
If you move your cursor over one of the elements, it will change to a hand. Clicking on an element will take you to a page with interesting information about that element. There is much more information here than we need to learn for this course but it is always good to know where to go if you need additional information in the future.
On the Lenntech site, you can also sort the elements of the periodic table in various ways, such as by their relative abundance in the human body. See if you can find the answers to the following questions in the web version of the periodic table.
REVIEW: The atom that represents the greatest weight in the human body is
REVIEW: The three most common atoms in your body are
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