Question

number of electrons with m=0 in Mn2+​

Answer 1

number of electron in Mn+2 is 23

as it has atomic number is 25 and as it has two electron less so 25 - 2= 23

Answer 2

electronic configuration of magnesium =2,8,2

then, electronic configuration of Mg2+

=2,8

so total no. of electrons=10