d-orbitals - 2026 ACF Regionals

Packet A: Tossup 15

Light-induced excited spin-state trapping is used to change energies between sets of these entities via spin crossover. Exchange (10[1])energy is plotted against interatomic distance normalized (-5[1])to the size of one of these entities in Bethe–Slater curves. Unlike MLCT and LCMT bands, transitions between these entities (10[1])are weak (10[1])because they are (10[1])Laporte (-5[1])forbidden. (-5[1])These entities expand (-5[1])in the (10[1])nephelauxetic (“NEFF-uh-lox-ET-ic”) effect (10[1]-5[1])upon a decrease in the (10[1])Racah B parameter. (-5[1])The Jahn–Teller (-5[1])effect (10[1]-5[1])describes (10[1])degeneracy (10[2]-5[1])breaking (10[1])among (10[3])the e-sub-g (10[3])and t-sub-2g (10[1]-5[5])sets (10[1]-5[2])of (10[1])these entities (10[2])obtained (10[2])from crystal (10[1])field (10[1])theory. (-5[1])A torus around (-5[1])two lobes (-5[1])characterizes (10[1]-5[2])the (-5[1])z-squared (0[1]-5[4])type (10[1]-5[3])of these entities. (10[1]-5[5])For 10 points, (10[1]-5[1])name (-5[1])these entities, (10[1])partially filled (0[1]-5[1])in transition metals, (10[3]-5[1])whose energies (10[1])lie (10[1]-5[1])between (10[1]-5[1])their p and f counterparts. (10[6]0[1])■END■ (10[21]0[12])

ANSWER: d-orbitals [accept dxy; or dxz; or dyz; or dz2; or dx2-y2 orbitals; accept diffuse orbitals; prompt on atomic orbitals or AOs; prompt on ligand fields or crystal fields until read; reject “molecular orbitals” or “MOs”]

<Wisconsin A, Chemistry> | Packet A - Brown A, Wisconsin A, Purdue, Maryland B

= Average correct buzzpoint

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Buzzes

Player	Team	Opponent	Buzzpoint	Value
Andrew Wang	Illinois A	Indiana C	17	10
Olin Bose	Columbia B	Maryland A	24	-5
Samarth Ram	Chicago B	Notre Dame B	44	10
Alex Akridge	Indiana A	Chicago E	46	10
Calvin Bostleman	Ohio State A	Ohio State B	49	10
Andrew Massaro	Catholic	Maryland C	50	-5
Eli O'Sick Johnson	Binghamton B	RIT	51	-5
Kevin Ye	Simon Fraser	Western C	54	-5
Karthik Jayaram	UCLA A	UCSD A	56	10
Tanay Bodducherla	Berkeley B	Berkeley D	58	-5
Ben Hellman	Swarthmore	John Jay	58	10
Swapnil Garg	Berkeley A	Stanford A	63	10
Ethan Ma	Illinois C	Chicago D	66	-5
Jacob Goodson	Ohio State C	Michigan State	68	-5
Shiva Tequila	Central Florida A	Florida B	69	10
Ali Hamzeh	Edinburgh A	Southampton A	69	-5
Krishna Girish	Montpellier	Cambridge A	70	10
Carter Yott	McMaster A	Toronto B	71	-5
Jacob Finley	Notre Dame A	Purdue B	71	10
Eugenia Tong	Imperial A	City St. George's	71	10
Ilyas Choukri	Virginia Tech A	William and Mary	72	10
Pace Klein	CWRU A	Michigan A	73	10
Jack Lewis	Bruin	Louisville A	73	10
S. A. Shenoy	Georgia Tech D	WashU B	73	10
Ariel Faeder	Pittsburgh	Michigan B	75	10
Matthew He	Texas A	Texas A&M A	75	10
Matthew Sumanen	Georgia Tech C	Sewanee	75	10
Alden Thompson	Carleton University	Guelph	77	-5
Russell Nip	UBC A	Ottawa	77	10
Coby Tran	Chicago C	Indiana B	77	-5
Rohan Dalal	Georgia Tech A	Carleton College	77	-5
Braden Booth	Missouri A	Iowa State	77	-5
Evan Roberts	Vanderbilt B	Tennessee A	77	-5
Ezra Santos	Chicago A	Northwestern C	78	-5
Rachel Bentham	Manchester	Imperial B	78	10
Brandon Weiss	Columbia C	Johns Hopkins A	78	-5
Yoyo Liu	UBC B	Waterloo B	79	10
Elokkin Pate-Geames	Tennessee B	Georgia Tech B	81	10
Eveline Ong	Oxford A	Edinburgh B	81	10
Khanh Nguyen	Florida C	Central Florida C	82	10
Caleb Slusher	South Carolina A	Liberty C	82	10
Shreyas Sinha	Texas B	Murray State A	84	10
Wyatt Johnson	CWRU B	Michigan C	85	10
Arran Bligh	Oxford C	Warwick A	86	-5
Ava Butler	McGill A	Toronto E	89	-5
Eshan Pant	NYU A	Georgetown	91	-5
Andrew Nucci	UCLA B	UCSD C	92	-5
Oliver West	Cambridge C	Bristol	92	-5
Vikshar Athreya	Rutgers A	NYU C	92	10
Aiden Bang	Johns Hopkins B	NYU B	93	-5
Ashlee Bacconi	UC Santa Barbara	Arizona State	94	-5
Franklin Wu	Toronto C	McGill B	94	-5
Fern Fang	VCU	Liberty B	94	-5
Parker McCoig	Tennessee A	Vanderbilt B	94	0
Patrick Hartley	Warwick B	Southampton B	94	-5
Abby Smith	Berkeley C	Stanford B	95	-5
Becca Wu	James Madison B	North Carolina C	95	-5
Jesse Mindel	NC State A	North Carolina A	95	10
Nathan Woolery	Louisville B	WashU A	95	-5
Noah Fine	North Carolina B	James Madison A	98	-5
Matthew Vidal	Northwestern D	Illinois B	98	-5
Albert Nyang	LSE	Imperial C	98	-5
Jacob Price	Cambridge B	Oxford B	98	-5
Sinecio Morales	Johns Hopkins A	Columbia C	98	10
Derek Li	Cornell C	Rochester	98	-5
Michael Du	Waterloo A	Queen's	101	10
Nihal Jacob	Kentucky	Alabama B	101	-5
Athan Juritsch	Toronto G	Brock	102	-5
Andrew Miller	Binghamton A	Cornell A	104	10
Aisling Skeet	Durham	UCL	106	-5
Alan Hughes	UCL	Durham	106	0
Emily Kadolph	Virginia Tech B	Wake Forest	109	10
Annika Larson	Claremont	Missouri B	109	-5
Simarya Ahuja	Washington B	Minnesota A	109	10
Teigue Kelly	Penn State	Cornell B	109	10
Ishan Joshi	Toronto Metropolitan	Western A	111	10
Avishka Fulgavkar	Florida A	Central Florida B	112	10
Suyesh Paraju	NC State B	Liberty A	112	-5
Dustin Vali	Western B	McMaster B	113	-5
Connor Ronan	South Carolina B	Duke	113	10
Denis Liu	Stanford B	Berkeley C	118	10
Shardul Parthasarathy	Illinois B	Northwestern D	118	10
Aaron Marchand	Carleton College	Georgia Tech A	118	0
Jake Wingfield	Bristol	Cambridge C	118	10
Zoë McGuire	Oxford B	Cambridge B	118	10
Ella Warde	Warwick A	Oxford C	118	10
Kelvin Ni	NYU B	Johns Hopkins B	118	10
Rishabh Dave	Berkeley D	Berkeley B	119	10
March Delfin	UCSD B	UC Irvine	119	10
Skand Parvatikar	Arizona State	UC Santa Barbara	119	0
Gary Lin	UCSD C	UCLA B	119	10
Milan Fernandez	Brock	Toronto G	119	0
Eva Mandelbaum	Guelph	Carleton University	119	10
Raymond Chen	Toronto B	McMaster A	119	10
Yusuf Baig	McMaster B	Western B	119	10
Luke Sloan	McGill B	Toronto C	119	0
Saju Ramraj	Toronto F	Toronto D	119	10
Sean Gao	Toronto E	McGill A	119	0
Jay Misuk	Western C	Simon Fraser	119	0
Jason Thieu	Michigan State	Ohio State C	119	10
Neal Sengupta	North Carolina C	James Madison B	119	0
Josh Schmidt	Liberty A	NC State B	119	10
Erin Williams	James Madison A	North Carolina B	119	0
Johanna Bryant	Liberty B	VCU	119	0
Cooper Stringer	Northwestern C	Chicago A	119	0
Safiya Hasan	Missouri B	Claremont	119	10
Eli Peterson	Iowa State	Missouri A	119	10
Davin Sivertson	Alabama B	Kentucky	119	10
John John Groger	WashU A	Louisville B	119	10
Teddy Fogel	Birmingham	Cardiff	119	10
Florrie the Mononymous	Southampton A	Edinburgh A	119	0
Ollie Glin-Conway	Imperial C	LSE	119	10
James Carrick-Lawson	Southampton B	Warwick B	119	10
Ian Parsons	Maryland C	Catholic	119	0
Andy Yu	Maryland A	Columbia B	119	10
Cole Hartung	Georgetown	NYU A	119	10
Jason Lee	Rutgers B	Vassar	119	0
Ezra Siegartel	Vassar	Rutgers B	119	10
Cade Reinberger	RIT	Binghamton B	119	10
Killian Simonson	Rochester	Cornell C	119	10

Summary

Tournament	Edition	Match	Heard	Conv. %	Neg %	Avg. Buzz
California (North)	Main Site	✓	3	100%	67%	100.00
California (South)	Main Site	✓	4	75%	50%	98.00
Canada	Main Site	✓	12	67%	58%	105.50
Florida	Main Site	✓	3	100%	0%	87.67
Great Lakes	Main Site	✓	5	100%	20%	80.20
Lower Mid-Atlantic	Main Site	✓	9	67%	44%	98.33
Midwest	Main Site	✓	8	63%	50%	59.20
Overflow	Main Site	✓	4	75%	75%	115.67
South Central	Main Site	✓	2	100%	0%	79.50
Southeast	Main Site	✓	7	86%	43%	90.00
UK	Main Site	✓	12	83%	58%	101.10
Upper Mid-Atlantic	Main Site	✓	8	88%	63%	103.29
Upstate NY	Main Site	✓	4	100%	50%	112.75