Dhaval Ran1 - patterns better when they were arranged in...

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Dhaval Rana Chemistry February 5, 2008 Chapter Review Section 1 Review 1. Describe the contribution made by the following scientists to the development of the periodic table: a. Cannizzaro presented a convincing method for accurately measuring the relative masses of atoms. Canniccaro’s method enabled chemists to agree on standard values for atomic mass and initiated a search for relationships between atomic mass and other properties of the elements. b. Mendeleev organized the elements according to their properties in his textbook that he was writing. Mendeleev noticed that when the elements were arranged in order of increasing atomic mass, certain similarities in their chemical properties appeared at regular intervals. Repeating patterns is referred to as periodic. c. Moseley examined 38 spectra of 38 different metals. Moseley discovered a previously unrecognized pattern. The elements in the periodic table fit into
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Unformatted text preview: patterns better when they were arranged in increasing order according to nuclear charge, or the number of protons in the nucleus. 2. State the periodic law Periodic law- the physical and chemical properties of the elements are periodic functions of their atomic number. In other words, when the elements are arranged in order of increasing atomic number, elements with similar properties appear at regular intervals. 3. How is the periodic law demonstrated within the groups of the periodic table? The elements are arranged in order of increasing atomic number; elements with similar properties appear at regular intervals. The Periodic table is an arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same column, or group Section 2 Reviews 4. How do the electron configurations within the same group of elements compare?...
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