Question

Considering the elements $K,Ca,Rb$ and $Cs$, the correct order of their metallic character is:

• A. $K<Ca<Rb<Cs$
• B. $Ca<Cs<Rb<K$
• C. $Cs<Rb<K<Ca$
• D. $Ca<K<Rb<Cs$

Answer 1

The correct option is D $Ca<K<Rb<Cs$

Metallic character refers to the level of reactivity of a metal. Metals tend to lose electrons in chemical reactions as indicated by their low ionization energies.

Metallic character decreases along a period from left to right. Therefore, metallic character of $KandCa$ follow the order: $K>Ca$. Within a group, metallic character increases from top to bottom so $Cs$ will be the most mettalic. Hence, correct order is: $Ca<K<Rb<Cs$