Does anyone remember a cartoon on TV in the called big world of little atom It taught about atoms and molecules etc?

Yes, there was an educational children's cartoon called "The Big World of Little Adam". It was created by Threshold Animation Studios and aired from 2008 to 2009. The show focused on the adventures of a tiny Atom named "Adam" who lived inside the body of a boy named "Alex" and taught viewers about science, especially the world of atoms, molecules, and cells. The series used animation and interactive elements to make learning about science fun and engaging for young viewers.