How many elements are there in the third tran | vedclass

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(B) The third transition series corresponds to the $5d$-series of elements.It starts from Lanthanum ($La$, atomic number $57$) and ends at Mercury ($H

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$10$

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(B) The third transition series corresponds to the $5d$-series of elements.It starts from Lanthanum ($La$, atomic number $57$) and ends at Mercury ($Hg$, atomic number $80$).However, the transition elements specifically refer to the elements from $Hf$ $(Z=72)$ to $Hg$ $(Z=80)$, but in the context of the $5d$ series as a block of transition elements, it consists of $10$ elements: $Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg$ and $La$ is often included in the series definition.Standard textbooks define the transition series as having $10$ elements each.

How many elements are there in the third transition series?

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