Chapter 2 - Chapter 2: Atoms, Molecules, and Ions Chapter...

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Chapter 2: Atoms, Molecules, and Ions Chapter Summary Sections 2.1 and 2.2 Atoms  are the basic building blocks of matter; they are the smallest units of an element that  can combine with other elements. Atoms are composed of even smaller particles, called  subatomic particles . Some  of these subatomic particles are charged and follow the usual behavior of charged particles: Particles with the same  charge repel one another, whereas particles with unlike charges are attracted to one another. We considered some of  the important experiments that led to the discovery and characterization of subatomic particles. Thomson's  experiments on the behavior of  cathode rays  in magnetic and electric fields led to the discovery of the electron and  allowed its charge-to-mass ratio to be measured. Millikan's oil-drop experiment determined the charge of the electron.  Becquerel's discovery of  radioactivity , the spontaneous emission of radiation by atoms, gave further evidence that  the atom has a substructure. Rutherford's studies of how thin metal foils scatter  particles showed that the atom has  a dense, positively charged  nucleus . Section 2.3  Atoms have a nucleus that contains  protons  and  neutrons electrons  move in the space around the  nucleus. The magnitude of the charge of the electron,  is called the  electronic charge . The charges  of particles are usually represented as multiples of this charge; thus, an electron has a 
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This note was uploaded on 04/17/2008 for the course ACHM 120 taught by Professor Shekhtman,alexander during the Spring '08 term at SUNY Albany.

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Chapter 2 - Chapter 2: Atoms, Molecules, and Ions Chapter...

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