In the first part of this lecture we describe the discovery of the electron and and how its mass and charge were measured. Then we discuss the experiments of Rutherford and the concept of the nuclear atom. The nucleus consists of protons and neutrons. This provides a more complete interpretation of the mass scale, and leads to the concept of isotopes.
In the second part of this lecture we will how atoms can combine to form molecules by formation of chemical bonds. We will discuss covalent and ionic bonds.
To prepare for this lecture, we suggest that you read sections 2.5 through 2.7 of Zumdahl
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