Question

In the given graph, a periodic property $(R)$ is plotted against atomic numbers $(Z)$ of the elements. Which property is shown in the graph and how it is correlated with reactivity of the elements?

• A. Ionisation enthalpy in a group, reactivity decreases from $a \to e$.
• B. Ionisation enthalpy in a group, reactivity increases from $a \to e$.
• C. Atomic radius in a group, reactivity decreases from $a \to e$.
• D. Metallic character in a group, reactivity increases from $a \to e$.

Answer 1

Answer: (B)

Ionisation enthalpy in a group, reactivity increases from $a \to e$.

Answer 2

I.E. in a group decreases and reactivity increases.