iupac.org 的前十大競爭對手

acs.org

American Chemical Society: Chemistry for Life.

rsc.org

Find out more about our information, advice and guidance to help you make decisions on learning, training and work.

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.

ptable.com

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

webelements.com

explore the chemical elements through this periodic table

aip.org

In early 2026 the Department of Labor is expected to post a notice of proposed rulemaking to revise upward the pay employers must offer to foreign workers who would have an H-1B visa or an employment-based green card. A prior rulemaking attempt offers clues as to how pay might be affected for…

ams.org

Advancing research. Creating connections.

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.