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The effective nuclear charge for a valence electron in Cobalt 2+
Accepted Answer
The effective nuclear charge (Zeff) for a valence electron in Cobalt(II) ion (Co2+) is approximately +15. This is calculated by subtracting the number of core electrons from the atomic number of cobalt. Cobalt has an atomic number of 27 and 25 core electrons (1s2, 2s2, 2p6, 3s2, 3p6, 3d8). Therefore, Zeff = 27 - 25 = +2.
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