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Many questions faced the researchers investigating the nature of the atom What caused the emission of light from atoms How were the electrons distributed in the atom Physicists and chemists from many countries searched for the solutions to this puzzle The results not only provided knowledge about the structure of the atom, but also a totally new approach to both physics and chemistry The history of the research into the nature of the atom is one of the most exciting stories of the twentieth century J J Thomson believed that a massive, positively charged substance filled the atom He pictured the negatively charged electrons as being distributed throughout this positively charged substance like raisins in a muffin Ernest Rutherford, along with laboratory collaborators Hans Geiger and Ernest Marsden, however, performed a series of experiments that showed the atom had a very different structure Rutherford s experiments made use of radioactive compounds that emitted penetrating rays Some of these emissions had been found to be massive, positively charged particles that moved at high speeds These particles, which were later named alpha particles, are represented by the symbol The -particles in Rutherford s experiments could be detected by the small flashes of light that were emitted when the particles collided with a zinc-sulfide-coated screen As shown in Figure 28-1, Rutherford directed a beam of -particles at an extremely thin sheet of gold foil Rutherford was aware of Thomson s model of the atom, and he expected only minor deflections of the -particles as they passed through the thin gold foil He thought that the paths of the massive, high-speed -particles would be only slightly altered as they passed through the evenly distributed positive charge making up each gold atom The test results amazed him While most of the -particles passed through the gold foil either undeflected or only slightly deflected, a few of the particles were scattered through very large angles Some were even deflected through angles larger than 90 A diagram of these results is shown in Figure 28-2 Rutherford compared his amazement to that of firing a 15-inch cannon shell at tissue paper and then having the shell bounce back and hit him.

Figure 28-1 After bombarding metal foil with alpha particles, Rutherford s team concluded that most of the mass of the atom was concentrated in the nucleus

Now that you ve got a basic understanding of drawing in an NSView and manipulating its geometry, let s move on to a new project: LOLmaker. LOLmaker is a simple application that lets you create your own LOLcat-style imagery by just dragging in an image and typing the text you want it to contain. It s not rocket science, but it will introduce you to a few more issues around drawing in an NSView.

Figure 28-2 Most of the alpha particles directed at the thin sheet of gold foil passed through it without deflection One in 20,000, however, were deflected at large angles

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