Database of Periodic Tables There are hundreds of periodic tables in web space, but there is only one comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Dr Mark R Leach. Harrington Periodic Tables So we start this effort tabula rasa (without preconceived ideas). 1) All atoms have a default "common denominator" structure at 270 mass units, irrespective of the element under discussion. Therefore, no elements seen as wisps and glints past this point are of consequence. Top of Page KAS Periodic Table The KAS periodic table reproduces and depicts the nuclear properties of chemical elements. The Segre Chart is based on the number of protons, Z, and the number of neutrons, N. Location that remains near the Neutron Dripline of element. Read more here, here and here. Sensu or Fan Periodic Table By NAWA, Nagayasu – A Japanese schoolteacher and periodic table designer – a "Sensu" or fan periodic table:
Top 10 Universities With Free Courses Online #1 UC Berkeley Ranked as the #1 public school in the United States, Berkeley offers podcasts and webcasts of amazing professors lecturing. Each course has an RSS feed so you can track each new lecture. Visit:Berkeley WebcastsVisit:Berkeley RSS FeedsVisit:UC Berkeley on Google Video Getting The Most From Berkeley Webcasts Berkeley Videos are in .rm format and real player can be a pain. Download:Real Alternative PluginDownload:Media Player Classic For Windows XP/2000Download:Media Player Classic For Windows 98/ME #2 MIT Open Courseware The Massachusetts Institute of Technology is ranked 7th nationally in the United States. Visit:MIT OpenCourseware Course ListingsVisit:MIT OpenCourseware Online TextbooksVisit:MIT Courses With Video LecturesVisit:MITWorld Public VideosVisit:MIT Pocast: ZigZag Getting the Most Out of MIT OCW Download:Foxit Reader #3 Carnegie Mellon's Open Learning Initiative Carnegie Mellon is a private research university ranked equal with Berkeley. Visit:Carnegie Mellon OLI
Microscale Gas Chemistry Our Gas Reaction Catalyst Tube can be used to demonstrate a variety of gas phase chemical reactions. The catalyst contains a layer of disbursed palladium atoms on a ceramic material and enclosed within a glass housing as per the fugure. Hydrogenation of alkenes occurs at very temperatures (even < 0 deg C). Gas Bags For classroom use, gases can be prepared and stored in sealable plastic food bags equipped with a dispensing tube. Mini-Ozone Generator Ozone is generated for in situ use. Left: Apparatus dispensing O3 to a flask.
Chemistry | 5.112 Principles of Chemical Science, Fall 2005 | Video Lectures | Lecture 26: Molecular Orbital Theory MIT A particle like slow light: Particles known as 'Weyl fermions' were discovered in materials with strong interaction between electrons. Just like light particles, they have no mass but nonetheless they move extremely slowly. -- ScienceDaily Weyl particles are not particles which can move on their own (like electrons or protons), they only exist as 'quasiparticles' within a solid material. Now, for the first time, such Weyl particles has been found in a special kind of material, which is particularly interesting for novel technological applications: scientists have measured Weyl fermions in a material with highly correlated electrons. Surprisingly, these fermions move very slowly, despite having no mass. There was great excitement back in 2015, when it was first possible to measure these 'Weyl fermions' -- outlandish, massless particles that had been predicted almost 90 years earlier by German mathematician, physician and philosopher, Hermann Weyl. Quasiparticles: only possible in a solid state "Quasiparticles are not particles in the conventional sense, but rather excitations of a system consisting of many interacting particles," explains Prof. A "light speed" of just 100 m/s In search of new effects
AP Chemistry Review Activities AP Chemistry Interactive Review Activities In keeping with the new framework for AP Chemistry beginning in 2013 - 2014, I am indicating here if the topic to which a review activity relates has been dropped from the curriculum. It will be identified as excluded (Excluded) to indicate that the College Board has specifically excluded it. I will leave the reviews here, however, in case some of you find them useful. These are not graded assignments. Each time you reload the activity, the problems will be in a different order, and the answers will be reshuffled!
Scientists discover crystal exhibiting exotic spiral magnetism An exotic form of magnetism has been discovered and linked to an equally exotic type of electrons, according to scientists who analyzed a new crystal in which they appear at the National Institute of Standards and Technology (NIST). The magnetism is created and protected by the crystal's unique electronic structure, offering a mechanism that might be exploited for fast, robust information storage devices. The newly invented material has an unusual structure that conducts electricity but makes the flowing electrons behave as massless particles, whose magnetism is linked to the direction of their motion. In other materials, such Weyl electrons have elicited new behaviors related to electrical conductivity. "Our research shows a rare example of these particles driving collective magnetism," said Collin Broholm, a physicist at Johns Hopkins University who led the experimental work at the NIST Center for Neutron Research (NCNR). More information: Gaudet, J. et al.