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JEE CHEMISTRY MCQ: d & f- BLOCK ELEMENTS
1
Medium
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Application
+4 | -1
A transition element X has the configuration in its +3 oxidation state. Its atomic number is
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Correct option: A
25
Option A (25) is correct because the atomic number is calculated by adding the electrons in the [Ar] core and the d4 configuration in the +3 oxidation state, then adding back the 3 electrons lost during ionization.
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