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Transition elements usually have high values, especially so for greater number of unpaired electrons. Why the exception here?

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According to "Atomic Structure and Periodicity" by Jack Barrett, the reason is a combination of the $d^5$ electron configuration (half filled subshell) in the gas state and, relative to chromium, "the extra electron in the metal occupying an anti-bonding region of a band, s or d".

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  • $\begingroup$ I didn't understand that? The d5 configuration should help, isn't it? $\endgroup$ – Aman Feb 24 '15 at 2:26
  • $\begingroup$ It should help stabilize the atomized gas phase $\endgroup$ – DavePhD Feb 24 '15 at 2:34
  • $\begingroup$ Oh so what about the other d5 config elements then? $\endgroup$ – Aman Feb 24 '15 at 4:11
  • $\begingroup$ In each row of transition metal elements, there is a drop in atomization enthalpy when you get to d5 $\endgroup$ – DavePhD Feb 24 '15 at 9:46

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