atomic number of Sn is is 50
1s2, 2s2 2p6, 3s2 3p6, 4s2, 3d10, 4p6, 5s2, 4d10, 5p2
but here tin is in +2 oxidation state so
no fo electrons are 50-2 = 48
so tin looses its two electrons from outer most which is 5P
so electronic configuration is
1s2, 2s2 2p6, 3s2 3p6, 4s2, 3d10, 4p6, 5s2, 4d10, 5p0
we know the basic principal
if element or ion is having any unpaired electron then it will exhibit paramagnitism
if there is no unpaired electrons then it is diamagnitic
in Sn2+ there is no any unpaired electron so diamagnitic
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