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In which group of modern periodic table, the elements of 4th, 5th and 6th period have different ground state electronic configuration for last two shells, from each other?

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answer is C.

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Detailed Solution

${}_{28}{N i} : {}_{18}{[A r]} 4 s^{2} 3 d^{8} {}_{46}{P d} : {}_{36}{[K r]} 4 d^{10} {}_{78}{P t} : {}_{54}{[X e]} 4 f^{14} 6 s^{1} 5 d^{9}$

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