How does the periodic table organize atoms of elements with the same number of valence electrons?
1.in cells
2.in columns
3.in diagonals
4.in rows

2.in columns

Explanation:

The elements of the periodic table is distribute as in 7 periods and 18 groups. The element is distribute on base on increasing atomic number. The period is called horizontal row and the group is called vertical column.  in periodic number of sphere around the nucleus remain the same, but as we move from left to right, the valence electrons continue to increase.so correct option is 2.in columns

One splits the atoms and molecules  the other combines them