Question

Which group is called the buffer group of the periodic table?

Answer 1

Hint : This periodic table is further divided into periods and groups. There are 7 periods and 18 groups. Period is the horizontal row of the periodic table. As we go along the group starting from the first period, we observe that the number of electrons increases. Therefore, from the left to write the number of electrons. Egg hydrogen has more electrons from helium, hydrogen has one and helium has two.

Complete Step By Step Answer:
The chemical reactivity of the elements from left to right increases but not for the last eighteenth group, because it has all filled electrons. As the number of electrons increases the number of unpaired electrons increases and so decreases the size of atoms and so increases the reactivity. Egg oxygen is always less electronegative than in fluorine as oxygen difluoride exists in which oxygen exists in a positive oxidation state.
Now the eighteenth is present between the seventeenth group of the halogens and the first group of the alkali metals. Now halogens are the group of most electronegative elements of our periodic table. This has seven electrons in the last shell and just needs one electron to fill their last shell. Alkali metals also have one electron in their last shell but its subshell so they have the tendency to lose their electron very readily to gain noble gas configuration, making them very electropositive.
Due to being between these two groups, the eighteenth group is called the buffer group because it does not form compounds generally but only Presence of very high electronegative elements.
The eighteenth or zero group is called the buffer group of the periodic table.

Note :
Groups are divided in the periodic table on the basis of the number of electrons in the last shell. All the electrons down the group have the same electrons and the electron shells increase so increases the size of the atom.