This sample represents oxygen in the "The Grand Tour of the Periodic Table" mineral collection from Jensan Scientifics. Visit my page about element collecting for a general description, or see photographs of all the samples from the set in a periodic table layout or with bigger pictures in num...
The samples (except gases) weigh about 0.25 grams each, and the whole set comes in a very nice wooden box with a printed periodic table in the lid. To learn more about the set you can visit my page about element collecting for a general description and information about how to buy one,...
They are labeled with the names of various different radio-pharmaceutical preparations used to deliver doses of Tc-99m (metastable Tc-99, an excited state of the Tc-99 nucleus with a half life of just a few hours). They are, in fact, made of pure lead, it's really only the labels...
Take a moment to see how the above image relates to the complete periodic table, which we reproduce below. Each row that begins with H down through Fr corresponds to a period; in this table, there are seven periods. Each column, labeled with small blue numbers 1-18 along the top of th...
Electron shells are labeled K, L, M, N, O, P, and Q or simply 1 to 7; starting with the shell closest to the nucleus and moving out. Each electron shell can hold a fixed, maximum number of electrons: the K shell holds a maximum of two electrons, the L shell holds eight electron...
Full size table In Experiment 2, the effect of set size was tested with either four or eight items presented (interleaved) in the search array (medium discriminability items were used). The SOA was titrated to minimize task difficulty differences between conditions (mean SOA ± SD: 4 item...
Business Diagrams Package is a large set of comprehensive graphical solutions from the ConceptDraw Solution Park, which are powerful in solving the business, marketing and quality tasks in completely different fields, such as finance, education, health food and cooking, HR, and many others. The too...
The purity of this sample is listed as 99% because that's what it was labeled as, but I suspect the purity is actually significantly higher, because the company it comes from generally works only with 99.99% thorium metal. They are probably just being conservative in rating this material sin...
I chose this sample to represent its element in myPhotographic Periodic Table Poster. The sample photograph includes text exactly as it appears in the poster, which you are encouraged to buy a copy of. Source: Contributor: 10 January, 2004 ...
using the thermite process, which allows two sections of rail to be joined into a single piece, leaving no visible weld or weak spot in the track. Welding the conventional way could not join the rails as completely, but thermite steel is so hot it is able to fuse the sections completely...