or
or
আয়নে বিজোড় ইলেকট্রনের সংখ্যা কত?
The answer is 4 because Co3+ (cobalt ion with a +3 charge) has lost three electrons from its neutral state. Cobalt (Co) has an atomic number of 27, meaning it has 27 electrons when neutral. The electron configuration for cobalt is [Ar] 4s2 3d7. When cobalt loses three electrons to form Co3+, it typically loses the two 4s electrons and one 3d electron, resulting in a configuration of 3d6.
In the 3d subshell, there are six electrons remaining, but they can pair up. In this case, there will be four unpaired electrons left in the 3d subshell. Therefore, the total count of unpaired (or "বিজোড়") electrons in Co3+ is 4.
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