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NEET levelSingle correct optionDifficulty 1 of 3df002

Among the following elements, the one that is NOT a transition element by the IUPAC definition (an element having an incomplete d subshell in the atom or in any of its common ions) is

AFe
BCu
CNi
DZn

Answer: D

Zn is

3 d^{10} 4 s^{2}

and its only common ion

Zn X^{2 +}

is

3 d^{10}

, so the d subshell is never incomplete.

Cu X^{2 +}

is

3 d^{9}

,

Fe X^{3 +}

is

3 d^{5}

and

Ni X^{2 +}

is

3 d^{8}

, so Cu, Fe and Ni qualify. Hence Zn is the answer.

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