Question

How many electrons are there in the valence shell of the O²⁻ ion? *


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Answer 1

Answer:

In O2−, there are two more electrons. Hence number of valence electrons in the O2− is 8

Answer 2

To find:

Number of electrons present in the valence shell of oxide ion.

Solution:

Oxide iron is formed after acceptance of two extra electrons into an oxygen atom:

$\boxed{ \sf{O + 2 {e}^{ - } \rightarrow \: {O}^{2 - } }}$

Now , we know that Oxygen has a total of 8 electrons which as distributed in the shells as follows:

K shell : 2 electrons

L shell : 6 electrons

Now , oxide ion has a total of 10 electrons which can be distributed into the shells as follows:

K shell : 2 electrons

L shell : 8 electrons

So, in this case L shell is the valence shell located most away from the nucleus ;

Final answer:

$\boxed{ \sf{ \red{8 {e}^{ - } \: in \: the \: valence \: shell}}}$