Question

Why is K+ much more stable than K2+?

Answer 1

In chemistry, the octet rule explains how atoms of different elements combine to form molecules.  Stability happens only when an atom has filled it's outermost shell with electron, In detail, S and P block elements should follow Octet Rule !.

Atomic number of k = 19, ... We see that, Potassium(k) has 1 electron in it's outermost shell, So k+ will have, 8 outermost electrons, According to Octet rule, K+ will be more stable !.

But K+ won't be free in state, It will combine with one negatively charged atom !.

Answer 2

K⁺ ions are more stable than  K²⁺ ions.

Explanation:

• Potassium is an element with atomic number 19 with symbol K and electronic configuration 1s2,2s2,2p6,3s2,3p6,4s1
• It is an element of Period 4 and group 1
• It is an element that keeps our body working properly.
• It helps to keep the nerve function and muscles working smoothly.
• It has two stable isotopes.
• It dissociates to give potassium ion K⁺ ions and K²⁺ ions.
• K⁺ ions is more stable as when potassium dissociates the outer most electrons in 4s1 are replaced and it attains the stable structure of inert gas whereas when  K²⁺  is formed it will not have an inert gas configuration to be stable.
• K⁺ ions are more stable than  K²⁺ ions.