manganese max value of zeff for 4s electron
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Explanation:
The configuration of Mn is 1s2 2s2p6, 3s2p6d5, 4s2. Since Zeff for 3d1 electron is greater than that for 4s1 electrons, the attraction between 3d electron and the nucleus of Mn atom is greater than the attraction between 4s electron and the nucleus.
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ElementMelting Point (°C)Cl–101.5Ar–189
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