Class 9 Science Chapter 4 Structure of the Atom explains the various theories and experiments conducted for finding out the shape and size of the atom.

One class of catalysts, the single-atom catalysts, makes efficient use of the expensive metal by supporting it as isolated atoms on another cheap material. Until now, the structure of those ...

Get NCERT based important extra questions (with answers) for CBSE Class 9 Science Exam 2020-21 from Class 9th Science NCERT textbook, Chapter 4: Structure Of The Atom. Prepare for CBSE Class 9 ...

Atomic Theory: Structure of the Atom: Students use the terms isotope, atomic number, mass number, and atomic mass to determine the number of subatomic particles in an isotope of an element.