the species that is both paramagnetic and coloured is
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We gots
O
=
V
(
S
O
4
)
, and breaking this up into its parent ions we gets...
S
O
2
−
4
and
{
V
=
O
}
2
+
...and in this ion vanadium has a
+
I
V
oxidation state..i.e. a
d
1
electronic configuration...
Vanadyl salts have a lovely purple colour in aqueous solution..and their salts have a vivid blue colour....
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