2.2 Evolution of Atomic Theory
Cathode-ray, oil-drop, and gold-foil experiments that revealed the electron, its charge, and the nucleus, and the isotopes that differ only in neutron count.
3 exercises
2.2 Exercise 1
The existence of isotopes violates one of the original ideas of Dalton’s atomic theory. Which one?
2.2 Exercise 3
How are protons and neutrons similar? How are they different?
2.2 Exercise 5
Predict and test the behavior of α particles fired at a Rutherford atom model.
(a) Predict the paths taken by α particles that are fired at atoms with a Rutherford atom model structure. Explain why you expect the α particles to take these paths.
(b) If α particles of higher energy than those in (a) are fired at Rutherford atoms, predict how their paths will differ from the lower-energy α particle…
Adapted from General Chemistry © 2019 Rice University. Licensed under CC BY 4.0. Sources: Chemistry 2e, Chemistry: Atoms First 2e. Imported at revision 32c7196.