Question

In the periodic table, the maximum chemical reactivity is at the extreme left (alkali metals) and extreme right (halogens). Which properties of these two groups are responsible for this?

• A. Least ionization enthalpy on the left and highest negative electron gain enthalpy on the right.
• B. Non – metallic character on the left and metallic character on the right.
• C. High atomic radii on te left and small atomic radii on the right.
• D. Highest electronegativeity on the left and least electronegativity on the right.

Answer 1

Answer: (A)

Least ionization enthalpy on the left and highest negative electron gain enthalpy on the right.

Answer 2

: Elements on the left side have lowest ionisation enthalpy due to which they can very easily lose electrons while the elements on the right can accept electrons easily as they show highest negative electron gain enthalpy.