" fow many'd' electrons are present in "Cr^(2+)" ion? "

How many 'd' electrons are present in Cr^(2+) ion?

How many 'd' electrons are present in Cr^(2+) ion?

How many 'd' electrons are present in Cr^(2+) ion?

How many electrons are present in Mg^(2+) ion?

How many electrons are present in the O ^(2-) ion ?

How many unpaired electrons are present in Mn^(2+) ion ? How do they influence magnetic behaviour of Mn^(2+) ion?