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The rows of the table are called periods; the columns are called groups. Six groups (columns) have names as well as numbers: for example, group 17 elements are the halogens; and group 18, the noble gases. The periodic table can be used to derive relationships between the properties of the elements, and predict the properties of new elements yet to be discovered or synthesized.
The modern arrangement of the elements is known as the Periodic Table of Elements and is arranged according to the atomic number of elements. Note that an element: 1  consists of only one kind of atom, 2  cannot be broken down into a simpler type of matter by either physical or chemical means, and. 3  can exist as either atoms (e.g. argon) or molecules (e.g., nitrogen).