Explain why elements 29 and 30 are transitional elements
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29 : is a transition element because the d sublevel in their +2 or +3 oxidation state is incomplete
(D9) ... Or ... (D8) so it is transition element
30 : is not a transition element because the d sublevel in free, and oxidation (+2) state is still completely filled
But it is added to only complete the transaction series in period .
Good luck
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