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How many main series of transition metals are there?
ASeven
BEight
CFour
DThree
Answer & Solution
Correct answer: C. Four
1. The series are named for the orbital being filled.
2. They run 3d, 4d, 5d and 6d.
3. So there are four main series.
_Source: NCERT Class 12 Chemistry Part I, Chapter 8, The d- and f-Block Elements._
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