01:160:159 Lecture Notes - Lecture 4: Noble Gas, Chemical Formula, Chemlab
8 Oct 2016
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Document Summary
2. 6 elements: a first look at the periodic table. Researchers noted recurring and periodic patterns of element behavior after receiving chemical reactions, properties, and atomic masses of elements. Dmitri mendeleev organized the information into a table that listed the elements by increasing atomic mass, arranged so that the elements with similar properties would fall in the same column. Periodic table of elements: arranged by atomic number, formatted as such each element has a box that contains its atomic number, atomic symbol and atomic mass; Boxes lie in order of the increasing number of protons (atomic number) Metals: shiny solids at room temperature (mercury is only liquid) that conduct heat and. Nonmetals: generally gases or dull, brittle solids at room temperature (bromine is liquid) and are poor conductors of heat and electricity. Metalloids: (semimetals) have properties between metals and nonmetals elements in a group have similar chemical properties and elements in a period have different chemical properties (sometimes a test question)
