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Which out of the following belongs to \( 3 d \) -series? This question has multiple correct options

1. copper
2. cobalt
3. gold
4. silver

Correct answer: cobalt

Solution

Cobalt is a first-row transition element with electron configuration [Ar] 3d^7 4s^2, so it belongs to the 3d series. Copper, silver, and gold are in the 4d/5d series, not the 3d series.

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