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  4. In 4 text th period of periodic table, how many elements have one or more 4 d electrons?

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Q. In $4^{\text {th }}$ period of periodic table, how many elements have one or more $4 d $ electrons?

Classification of Elements and Periodicity in Properties

Solution:

$4^{\text {th }}$ period comprises of $4 s , 3 d$ and $4 p$.

$4 d$ elements will lie in $5^{\text {th }}$ period