Classification ...

A solution of $$CuSO_{4}$$ was kept in an iron pot. After few days the iron pot was found to have a number of holes in it. The balance equation of the reaction involve is:

Electronic configuration of magnesium is:

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl?

The order of first electron affinity of O, S and Se is :

The electron affinity for the inert gases is :

The atomic number of chlorine is 17. Its electronic configuration is:

The noble gases are nonreactive because :

In this ladder, symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic number in the periodic table.

As you go down in a group, the alkali metals become:

Which group of elements could be placed in Mendeleev's Periodic Table without disturbing the original order?