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20 Apr 2018
17% (1 vote)
0% (0 votes)
0% (0 votes)
0% (0 votes)
17% (1 vote)
0% (0 votes)
33% (2 votes)
0% (0 votes)
17% (1 vote)
17% (1 vote)
0% (0 votes)
0% (0 votes)
Total votes: 6

For names with an odd number of letters the center letter must be a valid symbol. For names with an even number of letters the center two letters must be a valid symbol.

25 Oct 2017
0% (0 votes)
28% (5 votes)
33% (6 votes)
17% (3 votes)
11% (2 votes)
6% (1 vote)
0% (0 votes)
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6% (1 vote)
Total votes: 18
29 Sep 2017
John Bercaw, Robert Bergman and Georgiy Shul’pin for C-H functionalization
19% (4 votes)
Jens Nørskov for heterogeneous catalysis
0% (0 votes)
Tsutomu Miyasaka, Nam-Gyu Park and Henry Snaith for perovskites in solar cells
10% (2 votes)
Jennifer Doudna, Emmanuelle Charpentier and Feng Zhang for their work on gene-editing technology Crispr
24% (5 votes)
Stanley Whittingham and John Goodenough for lithium ion batteries
24% (5 votes)
Harry Gray and Stephen Lippard for bioinorganic chemistry
14% (3 votes)
Some other worthy recipient(s)
10% (2 votes)
Total votes: 21
24 Aug 2017

How are you going to use VIPEr this year?

Submitted by Chip Nataro, Lafayette College
There are some great new literature discussion LOs I plan to use in class
38% (5 votes)
I'll use it to come up with exam questions
8% (1 vote)
I'm going to use one of the labs
0% (0 votes)
George Stanley's new organometallics 'book'
15% (2 votes)
I need some feedback on an idea from the forums
8% (1 vote)
Shhh, I'm in denial about the semester/trimester/quarter starting
31% (4 votes)
Total votes: 13
3 Jun 2017

Literature Discussion of "A stable compound of helium and sodium at high pressure"

Submitted by Katherine Nicole Crowder, University of Mary Washington
Evaluation Methods: 

Students could be evaluated based on their participation in the in-class discussion or on their submitted written answers to assigned questions.

Evaluation Results: 

This LO has not been used in a class at this point. Evaluation results will be uploaded as it is used (by Spring 2018 at the latest).


This paper describes the synthesis of a stable compound of sodium and helium at very high pressures. The paper uses computational methods to predict likely compounds with helium, then describe a synthetic protocol to make the thermodynamically favored Na2He compound. The compound has a fluorite structure and is an electride with the delocalization of 2e- into the structure.

This paper would be appropriate after discussion of solid state structures and band theory.

The questions are divided into categories and have a wide range of levels.

Dong, X.; Oganov, A. R.; Goncharov, A. F.; Stavrou, E.; Lobanov, S.; Saleh, G.; Qian, G.-R.; Zhu, Q.; Gatti, C.; Deringer, V. L.; et al. A stable compound of helium and sodium at high pressure. Nature Chemistry 2017, 9 (5), 440–445 DOI: 10.1038/nchem.2716.

Learning Goals: 

After reading and discussing this paper, students will be able to

  • Describe the solid state structure of a novel compound using their knowledge of unit cells and ionic crystals
  • Apply band theory to a specific material
  • Describe how XRD is used to determine solid state structure
  • Describe the bonding in an electride structure
  • Apply periodic trends to compare/explain reactivity
Implementation Notes: 

The questions are divided into categories (comprehensive questions, atomic and molecular properties, solid state structure, electronic structure and other topics) that may or may not be appropriate for your class. To cover all of the questions, you will probably need at least two class periods. Adapt the assignment as you see fit.

CrystalMaker software can be used to visualize the compound. ICE model kits can also be used to build the compound using the template for a Heusler alloy.

Time Required: 
2 class periods


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