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Variation of Valency

Element ‘A’ a...

Question

Element ‘A’ and 'B' both have atomic numbers 18 and 16 which of respectively. Which of these two would be more reactive and why?

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Solution

Electronic configuration of ‘A’ (Z =18) = 2,8,8
Electronic configuration of ‘B’ (Z =16) = 2,8,6
Element 'A' has completely filled outermost shell (M-shell). It would be, therefore, least reactive.
Element 'B' has an incomplete outermost shell (M-shell has 6 electrons) only.
Conclusion: Therefore, element 'B' would be more reactive than element 'A'.

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