Question

All the elements of the same group will have:
A.Same electronic configuration
B.Similar outer electron configuration
C.Same ionization potential value
D.Different chemical properties

Answer 1

In the Modern Periodic Table the Categorisation is purely based on the number of the groups and the periods. The horizontal rows are called periods and the vertical columns are known as groups. There are 7 periods and 18 groups in the modern periodic table.

Complete answer:
The atomic number of the elements increases as you move down a group or across a period since the number of shells and the orbitals also increase and thus the atomic number increases due to the increase in the number of electrons and in turn they have the different electronic configurations. The atomic radius increases down the group since the grip of the nucleus on the outermost electrons becomes so weak. So their ionization potential values are also different from each other.
In the same group the elements have the same chemical properties since they belong to a family having a lot of chemical properties in common. Thus the chemical properties of the elements in a group are similar.
Although the number of electrons increases at each successive level in a group. The outer electronic configuration of the shells remains the same since all the elements in a group have the same number of valence electrons. Thus the outer electron configuration remains the same.

Thus the option B. Similar outer electron configuration is the correct answer.

Note:
The measure of the size of the atom is known as atomic radius. It is usually the mean distance from the center of the nucleus to the boundary of the surrounding shells of electrons. The atomic radius increases in the group.