Explanation:
The periodic table is divided into rows and columns.
Atoms within a row of a periodic table have the same orbital levels. As you go across the row, an electron is added to the outermost orbital level and a proton to the nucleus (this creates new atoms), until a stable electron configuration is achieved at the end of the row to form noble elements.
As you go down the column, the atoms get an extra electron orbital shell. Remember as you go down the rows also the mass number of atoms increases.
Therefore electrons down a column have similar properties of having the same number of electrons in their outermost shell.
Atoms with the lowest mass are found in the top left of the table while those with the highest are found at the bottom right of the table.
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