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Question

The group number, number of valence electrons, and highest possible value of oxidation number of element having atomic number 25, respectively, are:

A
7, 2 and +7
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B
7, 7 and +7
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C
5, 7 and +2
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D
5,7 and +7
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Solution

The correct option is B 7, 7 and +7
The element with atomic number (Z)=25 is Manganese.
Electronic configuration of Manganese:
Mn[Ar]4s23d5
Number of valence electrons =7
So, Manganese belongs to group number 7.
The highest possible value of oxidation number of Mn is +7

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