When I say valency of one oxide ion is -2, what do I mean with the respect to electrons?
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When we say valency of oxide ion is -2 then it means that oxygen has gained two electrons in order to complete it's octet because oxygen has 6 electrons in its outermost shell and it wants to attain stability. As it can't lose 6 electrons, it gains 2 electrons and hence has a valency of -2.
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when we say valency of one oxide is -2 this means that oxygen has gained 2 electrons to complete it's octet as it needed to have 8 electrons in the L shell but it have only 6 becoz it's atomic no. is 8 so it's electronic configuration is 2,6 means it needs to gain 2 electrons to make it's 6 as 8.
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SandeepJ:
Can u please also tell what does it means when i m talking about ions with positive charge like BA (Barium)2+
it means that barium is a monoatomic ion
which have two atoms of its element
ex. O2, N2
ok thank you
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