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Kennedy_4952
#1 Posted : Wednesday, June 10, 2020 12:01:17 AM
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I am wondering which groups on the periodic table gave half full and completely full subshells? Obviously the noble gases have a full subshell, but for the half full subshells for groups I found some conflicting information. Also, if you could let me know some common trend deviators I would appreciate it!
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INSTR_Katerina_102
#2 Posted : Wednesday, June 10, 2020 2:01:49 AM
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Hello,

This is a good question.

For half filled subshells, this is especially relevant for the d block metals. Elements in the 5th column of the d block (Mn, Tc, Re) have half filled subshells.

However, for the 4th column of the d block, with Cr, Mo and W, the stability of the half filled subshell is so great that one electron actually gets taken out of the s orbital and promoted to fill a 5d shell. This is the main significant exception for the MCAT.

Otherwise, half filled shells occur where one would expect, at d5, p3 etc.
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