Question

why two rows are at last of the periodic table

Answer 1

The elements are arranged in order of their atomic number. The atomic number is the number of protons each atom has in its nucleus. By arranging the elements in this way, those with similar properties (characteristics) are grouped together. As with any grid, the periodic table has rows running left to right, and columns running up and down. The rows are called PERIODS and the columns are called GROUPS.

the elements contained in that row , if added will not match the characteristics of the classified groups

Answer 2

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Because those elements have very different characterstics