technetium - Southern California

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


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