background preloader

Atomic Weights and Isotopic Compositions for All Elements

Atomic Weights and Isotopic Compositions for All Elements
Related:  Websites

Grand Orbital Table by Manthey Grand Orbital Table All atomic orbitals with n<=10 are presented here. Note that the orbitals with negative m are identical to those with the same magnitude positive m value except for a rotation,and are not shown separately. The orbitals are presented in six different ways, n and l versus m, n and m versus l, l and m versus n, n-l and l-m versus m, n-l and m versus l-m, and l-m and m versus n-l. n and l versus m Return to top of page. n and m versus l l and m versus n n-l and l-m versus m n-l and m versus l-m l-m and m versus n-l Return to Atomic Orbitals or the Site Map.

Molecule of the Month Welcome to the Molecule of the Month page! This is one of the longest running chemistry webpages on the internet. Each month since January 1996 a new molecule has been added to the list on this page. The links will take you to a page at one of the Web sites at a University Chemistry Department or commercial site in the UK, the US, or anywhere in the world, where useful (and hopefully entertaining!), information can be found about a particularly interesting molecule. If you wish to contribute a Molecule of the Month page, just email me the URL and I'll add you to the list at the next opportunity. What do I need to see the pages properly? See here for all the details of software and helper files you require. See here for a list of the awards and citations received by this page and a disclaimer. Above is a drop-down alphabetical list of all the molecules. Buy a book containing many of these molecules!

Finder – RFID Locator by Chu Wang, Qiujin Kou, Qian Yin & Yonghua Zhang Key Control Finder is a two-part RFID Locator comprising of the main terminal and tab stickers. Basically you are supposed to stick the tracking stickers to objects that you tend to misplace often, like keys, phone, wallet etc. Configure the sticker with the appropriate label on the main terminal and you are set to use it. No more lost keys again, yay! ThermoDex Select PROPERTIES you are looking for: About ThermoDex | List of Titles Indexed | Finding Thermodynamic Infomation (Guide) | Library Catalog ThermoDex contains records for selected printed and web-based compilations of thermochemical and thermophysical data for chemical compounds and other substances. You can select one or more compound types and link them to one or more property terms, and ThermoDex will return a list of handbooks that could contain these data. Due to copyright and technical considerations, the actual data are not contained in ThermoDex. To use ThermoDex, select multiple properties in the options list on your left, and click Search. Welcome to the new ThermoDex! ThermoDex 4.0 Beta is in the process of an upgrade.

Black Phoenix Alchemy Lab Perfume Oils: Welcome to the Lab The Amazing 'Throwable Panoramic Ball Camera' - Kasia Cieplak-Mayr von Baldegg - Video Jonas Pfeil, a student at the Technical University of Berlin, noticed that there was no easy way to take a complete spherical, panoramic photograph. Even if you had enough cameras and the right software, you would still have the problem of a tripod or camera mount blocking one angle. The solution? Pfeil describes how his invention works on his website: Our camera uses 36 fixed-focus 2 megapixel mobile phone camera modules. Other members of the project are Kristian Hildebrand, Carsten Gremzow, Bernd Bickel, Marc Alexa, and the patent is pending. For more information, visit

How big is a mole? (Not the animal, the other one.) - Daniel Dulek A comprehensive biography of Avogadro can be found here: The mole is taught in every introductory chemistry class one can take at the college level. Here's an example of a chemistry course: There is an entire day dedicated to commemorating Avogadro's Number. Sparknotes is a great resource for quick learning. "The primary unit for the amount of substance in a chemical element is the mole, and if you are talking about the stoichiometry of a reaction, the mole is the basis for that." MyChemicals | CAMEO Chemicals | NOAA

Ancient underwater cities being found that are 10,000 years old Lost city 'could rewrite history' By BBC News Online's Tom Housden The remains of what has been described as a huge lost city may force historians and archaeologists to radically reconsider their view of ancient human history. Marine scientists say archaeological remains discovered 36 meters (120 feet) underwater in the Gulf of Cambay off the western coast of India could be over 9,000 years old. The vast city - which is five miles long and two miles wide - is believed to predate the oldest known remains in the subcontinent by more than 5,000 years. The site was discovered by chance last year by oceanographers from India's National Institute of Ocean Technology conducting a survey of pollution. Using sidescan sonar - which sends a beam of sound waves down to the bottom of the ocean they identified huge geometrical structures at a depth of 120ft. Lost civilization The city is believed to be even older than the ancient Harappan civilization, which dates back around 4,000 years. Continued...

Chemistry Crayon Labels set of 48 by QueInteresante Reversible flow (when I show this in class, minds are blown) | Bilgidrom- Where Knowledge Is Power 12Google + 33StumbleUpon Interesting video showing Laminar Flow and demonstrating fluid flowing in layers. Very cool! 15 Awesome Chemistry GIFs You don’t need to watch Breaking Bad to know that chemistry is pretty awesome. Below, we explore our favorite 15 chemistry GIFs and the science behind them (when we could figure it out): Melting Metal With Magnets The Science: The copper wire has a significant amount of AC electricity running through it, causing it to act like a really strong electromagnet. In the metal slug, eddy currents form due to the magnetic field the copper wire is causing while the copper wire has high frequency AC flowing through it. The metal slug’s electric resistance causes a portion of the electric energy to turn into heat, but the heat builds up until the metal slug becomes white hot and melts. Orange LED Light In Liquid Nitrogen The Science: When an LED is immersed in liquid nitrogen, the electrons lose a lot of thermal energy, even when the light isn’t turned on. Awesome Chemistry GIFs: Heating Mercury Thiocyanate Hydrogen Peroxide Catalyzed By Potassium Iodide

Twelve Free Chemistry Databases Just two years ago, trying to find free online chemistry databases was an exercise in futility. Now, they're sprouting up all over the Web like wildflowers after a wet Spring. What follows is a far-from-complete roundup of some of the more interesting places to start your chemical search. PubChem- The granddaddy of all free chemistry databases. What makes disappearing ink disappear? | 200 Questions About Chemistry Carbon dioxide. A common type of disappearing ink is based on an acid-base indicator called thymolphthalein. This is a molecule that absorbs visible light when it is in an alkaline solution, and becomes colorless in a neutral or acidic solution. Thymophthalein To turn it into a blue ink, we add sodium hydroxide (lye), a strong alkali. But if we allow the ink to soak into paper or cloth, so that there is a lot of surface area in contact with the air, it will absorb carbon dioxide from the air. The neutral solution is no longer blue, but colorless.