periodictable.com的 10 大竞争对手

webelements.com

explore the chemical elements through this periodic table

ptable.com

Interactive periodic table showing names, electrons, and oxidation states. Visualize trends, 3D orbitals, isotopes, and mix compounds. Fully descriptive writeups.

lenntech.com

lenntech designs, builds and installs a wide range of odour treatment, water purification and air filtration products using uv, ozone, ecosorb, drum filtration. also cooling towers.

environmentalchemistry.com

this site provides chemistry, environmental and hazardous materials news, careers & resources including: in depth articles; a detailed periodic table of elements; chemical database; hazmat emergency response guides; hazmat placarding information; and much more.

sciencenotes.org

Sun candle (subsun) explained: what it is, how it forms, where to see it, and how it differs from sun pillars and sundogs.

americanelements.com

American Elements: The Materials Science Company™ | Certified bulk & lab quantity manufacturer & supplier of metals, chemicals, nanoparticles & other advanced materials.

pubchem.ncbi.nlm.nih.gov

PubChem is the world's largest collection of freely accessible chemical information. Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and physical properties, biological activities, safety and toxicity information, patents, literature citations and more.

theodoregray.com

Home page of Theodore Gray, author, publisher, developer stitchcoder. Creator of The Elements: A Visual Exploration, co-founder of Wolfram Research, makers of Mathematica and Wolfram|Alpha.

angstromsciences.com

Angstrom Sciences manufactures circular magnetron sputtering cathodes, linear magnetron sputtering cathodes, cylindrical magnetron sputtering cathodes and supplies sputtering targets for the Physical Vapor Deposition of thin film coatings.