Name an element of lanthanide series which is well known to show + 4 oxidation state
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These extra oxidation states are stable due to the presence of either half filled or fully filled or empty f sub shell. Cerium shows +4 oxidation state.. Cerium has the atomic number=58. ... The +4 oxidation state is shown because after losing 1 electron from the f sub shell, it attain a noble gas configuration
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