lanthanides - 2024 ACF Fall

Question

Didymium (“dye-DIM-ee-uhm”) safety glass lenses contain two of these elements, praseodymium (“praise-ee-oh-DIM-ee-uhm”) and neodymium (“neo-DIM-ee-uhm”). For 10 points each:

[10m] Identify this group of elements with a partially-filled 4f orbital, which are nicknamed for being difficult to separate rather than their individual scarcity.

ANSWER: lanthanides [or lanthanoids; accept rare-earths or rare-earth elements or rare-earth metals]

[10h] Four separate elements, including three lanthanides, are named for being discovered in this Swedish village. Though they aren’t named for it, gadolinium, holmium, thulium, and scandium were also discovered in this village.

ANSWER: Ytterby

[10e] One of the four elements named for Ytterby, erbium, is used to dope glass for optical amplifiers for these devices. A red beam of collimated light is produced by these devices through stimulated emission.

ANSWER: lasers

Back to bonuses

Summary


2024 ACF Fall at Cornell	fall	Y	9	20.00	100%	78%	22%
2024 ACF Fall at Ohio State	fall	Y	8	21.25	88%	100%	25%
2024 ACF Fall at Georgia	fall	Y	13	20.77	92%	92%	23%
2024 ACF Fall at North Carolina	fall	Y	9	17.78	100%	56%	22%
2024 ACF Fall at Claremont Colleges	fall	Y	5	26.00	100%	100%	60%
2024 ACF Fall at Illinois	fall	Y	9	23.33	100%	89%	44%

Data


Michigan D (UG)	CWRU B (DII)	10	0	10	20
Miami B (UG)	Michigan State A	10	10	10	30
James Madison A	Duke B	10	0	10	20
James Madison B	Liberty B	0	0	10	10
UCLA B	UCLA C	10	10	10	30
UCLA D	UCLA E	10	0	10	20
Cornell C	Binghamton A	10	10	10	30
Cornell G	Binghamton C	10	0	10	20
RIT B	Cornell D	10	10	10	30
Cornell B	ESF	10	0	10	20
Penn State	Cornell A	0	0	10	10
CWRU A (UG)	Miami C (DII)	10	10	10	30
Michigan State B	Michigan C	10	0	10	20
Miami A (UG)	Ohio State A (UG)	10	0	10	20
Michigan A (UG)	Ohio State C (DII)	10	0	10	20
Jefferson County Scholars (DII)	West Virginia A (UG)	10	0	10	20
West Virginia B (UG)	Michigan B (UG)	10	0	0	10
Georgia Tech A	Georgia Tech B	10	0	10	20
Furman	Georgia Tech B	10	10	0	20
Georgia Tech E	Clemson A	10	10	10	30
Georgia Tech E	Clemson A	10	10	10	30
Georgia Tech E	Clemson A	10	10	10	30
Georgia Tech E	Clemson A	10	10	10	30
Georgia Tech E	Clemson A	10	10	10	30
Georgia Tech E	Clemson A	10	10	10	30
Georgia Tech E	Clemson A	10	10	10	30
Georgia Tech E	Clemson A	10	10	10	30
South Carolina A	Georgia Tech C	10	0	10	20
Auburn B	South Carolina B	10	0	10	20
Appalachian State A	Virginia Tech B	0	0	10	10
Appalachian State B	William & Mary	10	0	10	20
UNC C	NC State	10	0	10	20
Tusculum	Liberty A	10	0	10	20
UNC A	UNC D	0	10	10	20
Virginia Tech A	UNC B	10	10	10	30
Virginia	Duke A	0	0	10	10
UCLA A	Claremont B	10	10	10	30
UCSD	Claremont C	10	10	10	30
USC	Claremont A	10	0	10	20
Northwestern A	Chicago B	10	10	10	30
Illinois A	Iowa B	10	0	10	20
Illinois B	Notre Dame A	10	10	10	30
Illinois C	Purdue A	10	10	10	30
WashU A	SIUE	10	0	10	20
Syracuse	Cornell E	10	0	10	20
U of Rochester A	Cornell F	10	0	10	20
RIT A	U of Rochester B	10	0	10	20
RIT C	Binghamton B	0	0	10	10
Auburn A	Belmont	10	0	10	20
Emory A	Clemson B	10	0	10	20
Georgia Tech D	Alabama A	10	0	10	20
Georgia Tech D	Alabama A	10	0	10	20
Georgia Tech D	Alabama A	10	0	10	20
Georgia Tech D	Alabama A	10	0	10	20
Georgia Tech D	Alabama A	10	0	10	20
Georgia Tech D	Alabama A	10	0	10	20
Georgia Tech D	Alabama A	10	0	10	20
Georgia Tech D	Alabama A	10	0	10	20
Georgia A	Mississippi State A	0	0	10	10
Vanderbilt A	Southern	10	0	10	20
Tennessee A	Vanderbilt B	10	0	10	20
Illinois D	Chicago A	10	0	10	20
Purdue B	Indiana	10	10	10	30
Northwestern B	Iowa A	10	0	10	20
Notre Dame C	WashU B	0	0	10	10