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NAME _____________________________________________________ DATE __________________ Ch 4 – Atoms: Study Guide Identify the scientists that were crucial to the development of the atom, and then identify their experiments and discoveries. (if an experiment wasn’t discussed, put none) Scientist Experiment Democritus Discoveries/Atomic Model ---------------------- Dalton Thomson Rutherford Bohr Schrodinger Chadwick In the space below, draw a model of an atom as we understand it today. Label the nucleus, protons, neutrons, and electrons. Write the appropriate charges on the particles. Explain the Law of Definite Proportions. Complete the table below. Particle Mass Charge Location Explain the difference between the atomic number, atomic mass, and mass number. What two particles make up most of the mass of an atom? ___________________________________ How do you find the number of neutrons in an atom? Although the nucleus is almost 100% of the mass of an atom, what determines the volume? Why do most atoms have no charge even though they are made up of positively charged protons and negatively charged electrons? Draw a Bohr model of a Carbon atom. How many valence electrons does Carbon have? _____ Define isotope. Are hydrogen-3 and helium-3 isotopes of same element? Explain why or why not. Which diagrams represent the same element? What is the atomic number for element A? What is the mass number for atom B? What is an energy level? How many electrons can go in the first energy level? The second? Isotopes have the [ same / different ] chemical and physical properties of the element. An isotope of an element has a mass of 89, and an atomic number of 56. Show this atom in isotope notation. Complete the following tables. Element Boron Symbol Atomic # Mass # 11 Germanium Protons Neutrons 41 Uranium 238 Osmium 114 Hydrogen 1 Cesium 78 Francium 223 88 50 62 54 138 119 88 Electrons Isotope He-7 Li-4 F-17 Ne-22 O-18 Eu-153 Ca-38 K-40 Lu-173 Ni-60 Au-196 Isotope Notation Atomic # Mass # Protons Neutrons Electrons
