Zinc and mercury do not show variable valency like d-block elements because:
A
They are soft
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B
Their d-shells are complete
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C
They have only two electrons in the outermost subshell
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D
Their d-shells are incomplete
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Solution
The correct option is B Their d-shells are complete Zinc and mercury do not show variable valency like d-book elements because their d- shells are completely filled.