Out of first $100$ elements no.of elements having electrons in $3 d$ orbital (in their complete electronic configuration) are:-

80

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100

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40

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60

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Solution

The correct option is C $80$
Elements from atomic number $21$ to atomic number $100$ have electrons in $3 d$ orbitals.
The total number of electrons $= 100 - 20 = 80$

Therefore, the correct answer is $A$ .

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