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3d-, 4d- and 5d- series consists of 10 e...

`3d-, 4d-` and `5d-` series consists of `10` elements each? Explain.

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In `3d, 4d` and `5d` series, the differenting electron enters to `(n-1)d`-subshell. The maximum capacity of `d`-subshell is to accommodate `10` electrons. Thus, there are `10` elements each in `3d, 4d` and `5d` series `[(n-1)d^(1-10)]`.
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