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  4. The electronic configuration of transition element X, is +3, oxidation state is [Ar] 3d5. What is its atomic number ?

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Q. The electronic configuration of transition element "X", is $+3$, oxidation state is $[Ar] 3d^5$. What is its atomic number ?

KCETKCET 2018The d-and f-Block Elements

Solution:

$X^{+3}$

$[Ar]3d^{5}$ : No of electrons $= 18 + 5 = 23$ + oxidation state

$= 23 + 3 = 26 = z$