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Q. The common positive oxidation states for an element with atomic number $24$ , are :

JEE MainJEE Main 2021The d-and f-Block Elements

Solution:

$\operatorname{Cr}( Z =24)$

$[ Ar ] 4 s ^{1} 3 d ^{5} Cr$ shows common oxidation states

starting from $+2$ to $+6$.