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Bellringer Read page 510 then answer the following questions: What significant changes occurred in the atomic model between Figure 5A and Figure 5B? What significant changes occurred in the atomic model between Figure 5B and Figure 5C? What significant changes occurred in the atomic model between Figure 5C and Figure 5D? Structure of the Atom Scientific Shorthand • C • Al • N • O • CO2 • H2O • All of these are symbols for an element or a compound • It is easier to write C rather than Carbon or H2O rather than Dihydrogen Oxide Atomic Components Element – matter that is composed of one type of atom Atom – smallest piece of matter that still retains the property of the element Atoms are composed of… Protons Neutrons electrons Inside the Nucleus Atoms contain a center positively charged that is composed of neutrons and protons Protons – particles with an electrical charge of +1 Neutrons – neutral particles that do not have an electrical charge Outside the Nucleus Outside the nucleus is a cloud of particles called electrons Electrons – particles with an electrical charge of -1 Atoms Atoms of different elements differ in the number of protons they contain (They usually differ in electrons and neutrons as well) Electron Cloud Many models for the atom have been attempted, but by 1926 scientist developed the electron cloud model that we use today. Electron cloud – is the area around the nucleus of an atom where its electrons are most likely found This area is 100,000 times larger than the diameter of the nucleus