The 'plum pudding' model of the atom was proposed by JJ Thomson, who had also discovered the electron. The 'plum pudding' model of the atom was proposed by JJ Thomson, who had also discovered the ...

A key to learning and studying chemistry is practice. Solving practice problems, working on equations and formulas should be a core feature of your daily study routine. Reviewing and working the ...

Students use the terms isotope, atomic number, mass number, and atomic mass. Atomic Theory: Structure of the Atom: Students use the terms isotope, atomic number, mass number, and atomic mass to ...

Niels Bohr's model of the hydrogen atom—first published 100 years ago and commemorated in a special issue of Nature—is simple, elegant, revolutionary, and wrong. Well, "wrong" isn't exactly ...