Excerpt by Michael Balmer's Notes:
we will use this Electronic Configuration :
Sr87
1s1 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2
we will use this Nuclear Configuration :
1D2/2 1F8/8 1G8/12 1H17/20 2D1/6 2F2/1
i know the EC is familiar and the NC is not,but that will come.
this is the most abundant stable isotope,it is Strontium 87
with the same electronic configuration,we move to the Nuclear configuration :
1D2/2 1F8/8 1G8/12 1H17/20 2D1/6 2F2/4
this is the Nuclear Configuration of Sr90 strontium 90