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Can lanthanum '(z)=57)' exhibit '+4', ox...

Can lanthanum '(z)=57)' exhibit '+4', oxidation state. Explain?

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Electronic configuration of .(Lu). is .[X (e)] 5 (~d)^(3) 6 s^(pm). .(Lu)^(4). has stuble contiguration of Xenon To exlibit Lat state. the stable electronic cońfiguratioon has to be disturbed. Hence La cannot exhibil .+4. state.
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