Question

On the basis of the metal activity series name the following.

A Metal in the 3rd period has the highest ionization energy.

Answer 1

1. The elements which are able to lose or donate electrons present in its valence shell are metals.
2. Based on their ability to lose electrons metals are arranged in the decreasing order of their reactivity and are called the reactivity series.
3. In the third period of the periodic table, the metals present are sodium($\mathit{N}\mathit{a}$), magnesium($\mathit{M}\mathit{g}$), and aluminium($\mathit{A}\mathit{l}$).
4. Aluminium is present in the p-block that is present on the right side of the periodic table.
5. Ionization enthalpy is the energy required to remove the most loosely bound electrons present in an element.
6. Ionization enthalpy increases on moving left to right.
7. The reactivity of metal also decreases with increasing Ionization enthalpy.
8. So aluminium is the metal that is having high ionization enthalpy so the reactivity of aluminium is also low since it cannot be able to lose electrons easily.

So, aluminium is the metal having the highest ionization enthalpy in the third period.