CHE 106 Lecture Notes - Lecture 4: Scanning Tunneling Microscope, Atomic Number, Nuclide
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All matter is composed of indivisible atoms. An atom is a small particle of matter that retains its identity during reactions. Scanning tunneling microscope invented which measures 3d profiles. Atoms of the same elements are similar in shape and mass but differ from the atoms of other elements. Mass is the number of atoms in a given element. Atoms are not created, destroyed, or broken into smaller particles by chemical reactions. A compound is a type of matter composed of atoms of 2 or more elements that are chemically combined in fixed proportions. Law of multiple proportions: atoms of the same element can combine in more than one ratio to form two or more compounds. Jj thomson conducted a series of experiments that showed atoms were not indivisible particles. He calculated the ratio of an electron"s mass, m e , to its electrical charge, e. He could not assign an actual mass or charge.
