why do some elements have variable valency
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The reason behind Why they lose this extra electron is purely a matter of the specific element, what electron shell they are losing/gaining electrons in, and their relative energies to the previous/ next electron shell. Also their ability to share electrons between these shells
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Answer:
All the element have tendency to complete the octates number of electrons which are present in outermost shell may absorb energy and jump into the higher energy levels shells . Due to with their valency not remain the same and these elements exhibit variable valency.
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