Which is a third transition series element?
A)B
B)Mg
C)Y
D)Ta

Question

Quizplus · Accepted Answer

The third transition series elements are found in the d-orbitals of the periodic table, specifically elements with atomic numbers ranging from 57 to 71 for the lanthanide series and 89 to 103 for the actinide series. Ta (tantalum) has an atomic number of 73, which falls within the transition series but not within the third transition series. B (boron) and Mg (magnesium) are not transition series elements, and Y (yttrium) is part of the fourth transition series. Therefore, the correct choice is D.

Which Is a Third Transition Series Element