technetium - 2025 ACF Fall

Question

Before it was discovered, Dmitri Mendeleev predicted this element would have properties similar to manganese and thus gave it the provisional name “eka-manganese.” For 10 points each:

[10h] Name this first synthetic element, created in 1937 by Carlo Perrier and Emilio Segrè. This element’s “99m” isotope was discovered after bombarding molybdenum in a cyclotron.

ANSWER: technetium [or Tc; accept technetium-99m or 99mTc]

[10e] Technetium’s “99m” isotope is used as a tracer in medical imaging because it has this property, allowing it to emit detectable gamma rays. Isotopes with this property are unstable and decay with a defined half-life.

ANSWER: radioactive [accept word forms like radioactivity; accept radioactive decay; accept radioactive isotopes or radioisotopes or radioactive nuclides or radionuclides; accept radioactive tracers]

[10m] Technetium dissolves in this fuming mixture of nitric acid and hydrochloric acid, whose Latin name was derived from its ability to dissolve noble metals like gold and platinum.

ANSWER: aqua regia (Aqua regia is Latin for “royal water.”)

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Summary


Northern California	Main	Y	4	30.00	100%	100%	100%
Southern California	Main	Y	7	22.86	86%	71%	71%
Eastern Canada (1)	Main	Y	4	22.50	100%	75%	50%
Florida	Main	Y	4	12.50	100%	0%	25%
Great Lakes	Main	Y	10	21.00	100%	70%	40%
Lower Mid-Atlantic	Main	Y	9	24.44	100%	67%	78%
Upper Mid-Atlantic	Main	Y	11	22.73	100%	73%	55%
Upper Mid-Atlantic	Main	Y	1	30.00	100%	100%	100%
Midwest	Main	Y	9	24.44	100%	78%	67%
North	Main	Y	4	20.00	100%	50%	50%
Northeast	Main	Y	2	20.00	100%	50%	50%
Pacific	Main	Y	8	26.25	100%	88%	75%
South Central	Main	Y	6	13.33	83%	33%	17%
Southeast	Main	Y	12	23.33	100%	58%	75%
UK (North)	UK	Y	5	18.00	100%	20%	60%
UK (South)	UK	Y	8	21.25	100%	50%	63%
Upstate NY	Main	Y	5	24.00	100%	60%	80%

Data


Berkeley Skeleton King	Berkeley Little Prince	10	10	10	30
Berkeley Archer Queen	Berkeley Mighty Miner	10	10	10	30
Berkeley Boss Bandit	Stanford A	10	10	10	30
Stanford B	UCSC	10	10	10	30
UC Irvine	Claremont A	10	10	10	30
Claremont B	USC B	10	10	10	30
UCLA B	UCLA A	10	10	10	30
UCLA D	UC Santa Barbara	0	10	0	10
UCLA E	UCLA C	10	0	0	10
USC A	UCLA F	0	10	10	20
UCSD B	Claremont C	10	10	10	30
McGill A	Ottawa D	10	10	10	30
McGill B	McGill C	10	10	10	30
McGill E	Ottawa A	0	10	0	10
Carleton A	Ottawa C	0	10	10	20
Florida A	Florida B	0	10	0	10
Florida State A	South Florida A	10	10	0	20
Florida Tech A	Florida Tech B	0	10	0	10
UCF A	ERAU Daytona A	0	10	0	10
Ohio State D	CWRU D	0	10	10	20
WVU A	Louisville B	0	10	0	10
Michigan A	Pittsburgh	0	10	10	20
Michigan B	Kentucky	0	10	10	20
CWRU C	Michigan C	10	10	10	30
Michigan D	WVU B	0	10	0	10
Liberty A	JMU B	10	10	0	20
William & Mary B	Liberty B	0	10	0	10
UNC D	Liberty C	10	10	10	30
UNC C	NCSU B	10	10	0	20
Virginia Tech B	Tusculum A	10	10	10	30
UNC A	VCU A	0	10	10	20
Virginia A	Virginia Tech C	10	10	10	30
Virginia Tech A	Duke A	10	10	10	30
William & Mary A	William & Mary C	10	10	10	30
CWRU B	Louisville C	10	10	10	30
Louisville A	Michigan State B	10	10	10	30
Ohio State A	CWRU A	10	10	10	30
Ohio State C	Michigan State D	0	10	0	10
George Mason B	George Mason C	0	10	10	20
Maryland B	Penn	10	10	10	30
Columbia A	Maryland C	10	10	0	20
Rutgers C	NYU A	0	10	0	10
Maryland A	NYU B	10	10	10	30
Rutgers A	NYU C	0	10	10	20
George Mason A	Rowan	0	10	10	20
Rutgers D	Lehigh A	10	10	10	30
Princeton	Stony Brook	10	10	10	30
Lehigh B	Vassar A	0	10	0	10
Rutgers B	Vassar B	10	10	10	30
Johns Hopkins	Columbia B	10	10	10	30
Purdue A	Chicago A	10	10	10	30
William Woods University A	Illinois Canada	10	10	10	30
WashU Grizzlers	Illinois Orange	10	10	10	30
Indiana B	Iowa A	0	10	0	10
Rose-Hulman A	Iowa B	10	10	10	30
Purdue B	Illinois Blue	10	10	10	30
Purdue C	Illinois Urbana	10	10	10	30
Indiana A	Purdue D	0	10	0	10
WashU Grolars	Illinois Champaign	0	10	10	20
Iowa State	Wisconsin B	10	10	10	30
Macalester	Minnesota	0	10	0	10
Wisconsin A	St. Thomas	10	10	10	30
Wisconsin C	Michigan Tech	0	10	0	10
Southern Connecticut State University A	Boston University B	0	10	0	10
Williams A	Tufts A	10	10	10	30
Alberta A	Texas	0	10	10	20
Alberta B	Boise State	10	10	10	30
Arizona State A	Washington Masu	10	10	10	30
Arizona State B	Washington Chinook	0	10	10	20
British Columbia B	Washington Coho	10	10	10	30
British Columbia C	Washington Sockeye	10	10	10	30
Washington Chum	Washington State	10	10	0	20
Washington Atlantic	Washington Steelhead	10	10	10	30
Murray State College B	Harding	0	10	0	10
Tulsa A	Nebraska B	10	10	10	30
Oklahoma	Central Oklahoma B	0	10	0	10
Rose State	Nebraska C	0	10	0	10
Vanderbilt A	Auburn B	10	10	0	20
Georgia Tech A	Auburn C	10	10	0	20
Auburn A	Clemson A	0	10	10	20
Georgia Tech B	Alabama A	10	10	10	30
Georgia Tech C	Georgia Tech F	10	10	10	30
Chipola College	Mississippi State A	0	10	0	10
Tennessee Tech	Sewanne	10	10	10	30
South Carolina A	Georgia A	10	10	10	30
Emory A	Tennessee A	10	10	10	30
Georgia Tech D	Tennessee B	0	10	0	10
Clemson B	Vanderbilt B	10	10	0	20
Georgia Tech E	Vanderbilt C	10	10	10	30
Sheffield A	Durham C	10	10	10	30
Durham D	Durham B	10	10	0	20
Edinburgh D	Edinburgh C	0	10	0	10
Sheffield B	Edinburgh B	10	10	0	20
Edinburgh A	York	0	10	0	10
Kansas State A	Central Oklahoma A	0	10	0	10
Murray State College A	Tulsa B	0	0	10	10
Binghamton B	Binghamton A	10	10	0	20
Cornell D	Binghamton C	10	10	10	30
Cornell B	ESF	10	10	10	30
RIT A	RIT B	10	10	10	30
Cornell C	Rochester	0	10	0	10
Birmingham	Imperial D	10	10	0	20
Imperial C	Bristol	0	10	0	10
Cambridge C	Cambridge A	0	10	10	20
LSE	Cambridge D	10	10	0	20
Southampton	Cambridge E	10	10	10	30
Imperial A	Cardiff	10	10	10	30
Oxford	Imperial B	0	10	0	10
Cambridge B	Warwick	10	10	10	30