Question

In potassium permanganate how many outer electrons are there in manganese

Answer 1

Answer:

KMnO 4 is potassium permanganate, where manganese is in the +7 state. No electrons exist in the 4s and 3d orbitals. The 3p orbitals have no unpaired electrons, so this complex is diamagnetic.

Explanation:

First of all, you don't call it Valency , it's the Oxidation number you are talking about.

First let mw tell you how you are going to calculate the Oxidation number or oxidation state of Mn. Let it be x

Now the overall molecule is neutral so you can say tha the sum of all oxidation states is equal to zero.

Here the oxidation numbers of K and O are +1 & -2 respectively.

Let's do the math now

KMnO4= K+Mn+4O

Hence,

(+1)+x+4(-2)=0

1+x-8=0

-7+x=0

x=+7

Hence the oxidation number of Mn here is +7

Now let's see what is the difference between valency and oxidation numbers so that you remember it for later