electron pairs - 2024 ACF Winter

Question

In a rather alphabetically convenient scheme, the Jemmis rules require a cluster to have m + n + o + p − q pairs of these things. For 10 points each:

[10e] Name these things, “skeletal” pairs of which are counted by Wade’s rules. In a Lewis diagram, these things are indicated by dots placed around atomic symbols.

ANSWER: electron pairs [or lone pairs; or nonbonding electrons; accept skeletal electron pairs]

[10m] Polyhedral skeletal electron pair theory is used to predict the structure of clusters of this element, as in Wade’s rules. The canonical 3-center-2-electron bond is found in a compound containing this element and hydrogen.

ANSWER: boron [accept diborane or borane]

[10h] Wade’s rules give this prefix to a boron cluster that has n vertices and n + 1 skeletal electron pairs. This prefix, contrasted with nido- and arachno-, indicates that a cluster compound is a complete deltahedron.

ANSWER: closo-borane [or closo clusters]

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Summary


2024 ACF Winter at Clemson	2024-11-16	Y	1	20.00	100%	100%	0%
2024 ACF Winter at Lehigh	2024-11-16	Y	6	13.33	83%	33%	17%
2024 ACF Winter at Northwestern	2024-11-16	Y	9	18.89	100%	78%	11%
2024 ACF Winter at Ohio State	2024-11-16	Y	7	15.71	100%	57%	0%
2024 ACF Winter at Online	2024-11-16	Y	8	11.25	100%	13%	0%
2024 ACF Winter at UBC	2024-11-16	Y	3	16.67	100%	33%	33%
2024 ACF Winter at Central Florida	2024-11-16	Y	5	14.00	100%	20%	20%
2024 ACF Winter at Brandeis	2024-11-16	Y	9	16.67	100%	56%	11%

Data


Auburn A	Georgia Tech B	10	10	0	20
Penn A	Bard A	10	0	0	10
Columbia A	Haverford A	10	10	10	30
Columbia B	Lehigh A	10	0	0	10
Penn State A	Princeton A	10	10	0	20
Rowan A	Rutgers A	0	0	0	0
Rutgers C	Johns Hopkins B	10	0	0	10
Indiana A	UChicago A	10	10	0	20
UIUC C	Miami	10	0	0	10
Purdue A	Northwestern A	10	10	0	20
Notre Dame	WashU C	10	0	0	10
Purdue B	UChicago D	10	10	0	20
SIUE A	Indiana B	10	10	0	20
UIUC B	UIUC A	10	10	0	20
UChicago C	UIUC D	10	10	10	30
UChicago B	WashU D	10	10	0	20
CWRU B (UG)	Pitt B (UG)	10	10	0	20
Kenyon A (UG)	Kenyon B (DII)	10	0	0	10
Michigan A	Pitt A	10	10	0	20
Michigan State A	Michigan B	10	10	0	20
Ohio State C (DII)	Michigan C (UG)	10	0	0	10
Michigan State C (UG)	CWRU D (DII)	10	0	0	10
Ohio State A (UG)	Ohio State B (DII)	10	10	0	20
NYU B	Central Oklahoma	10	0	0	10
Mississippi State	Oregon State	10	0	0	10
NYU A	Missouri	10	0	0	10
Iowa	Texas A	10	0	0	10
Colorado College	Texas D	10	0	0	10
Texas B	Vassar A	10	0	0	10
Texas C	Vassar B	10	0	0	10
WUSTL A	McGill E	10	10	0	20
Alberta	SFU	10	0	0	10
UBC A	UBC B	10	10	10	30
UW A	UW B	10	0	0	10
Florida State University A	UF A	10	0	0	10
UF C	UCF B	10	0	0	10
UCF A	UF D	10	10	10	30
UF E	Florida Tech B	10	0	0	10
Florida Tech A	UF F	10	0	0	10
Amherst A	Boston University B	10	10	0	20
Boston University A	Clark A	10	0	0	10
Yale B	Bowdoin B	10	10	0	20
Tufts A	Brown A	10	0	0	10
Yale C	Carabrandeis	10	0	0	10
Bowdoin A	Diamond Brandeis	10	0	0	10
Harvard A	Tufts B	10	10	10	30
MIT A	Brandeises Brew	10	10	0	20
Yale A	Northeastern A	10	10	0	20