... smaller particles, called subatomic particles. Scientists believe that there is at least 200 subatomic particles. The three main subatomic particles are the neutron, proton, and electron. In the middle of the atom there is a nucleus. The nucleus makes up 99.9 percent of the atoms weight even though it is a ... . The third holds eighteen electrons, the fourth and fifth energy levels hold up to thirty-two electrons. The sixth energy level can bear eighteen electron, the seventh energy level can hold eight electrons. The eighth and outermost energy level can accommodate for a mere two elect...

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• Approx Pages: 17
• Grade Level: High School