Atoms and Periodic Table. Chapter 17. Scientific Shorthand. Scientists have developed their own shorthand for dealing with long, complicated names. Chemical symbols consist of one capital letter or a capital letter plus one or two smaller letters.
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Thompson - 1904
Rutherford - 1911
Bohr - 1913
Electron Cloud Model 1926 to present
Protons Identify the Element
Mass Number and Neutrons
number of neutrons = mass number – atomic number
Rows on the Table