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Among the following series of transition metal ions, how many metals ions have d^(2) electronic configuration Fe^(4+), V^(3+), Sn^(2+), Au^(3+)Ti^(2+), As^(3+), Cr^(3+), Mn^(5+)Co^(3+), Zr^(2+), Cd^(2+), Mo^(4+), La^(2+), Ta^(4+), Co^(6+), Ni^(4+) |
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