Answer:
2.in columns
Step-by-step 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