The transition metal with least atomic number is:

O s

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Z r

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P t

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R u

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Solution

The correct option is B $Z r$

Element

Atomic Number

Os

76

Zr

40

Pt

78

Ru

44

These all are transition elements as they belong to d-block and they have an incomplete electronic configuration.
$\to$ Zirconium have a least atomic number

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