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periodical table notes
John Newlands proposed an organization system based on increasing atomic mass in 1864. • He noticed that both the chemical and physical properties repeated every 8 elements and called this the ____Law of Octaves ___________. • In 1869 both Lothar Meyer and Dmitri Mendeleev showed a connection between atomic mass and an element’s properties. • Mendeleev published first, and is given credit for this. • He also noticed a periodic pattern when elements were ordered by increasing ___Atomic Mass _______________________________. • By arranging elements in order of increasing atomic mass into columns, Mendeleev created the first Periodic Table. • This table also predicted the existence and properties of undiscovered elements. • After many new elements were discovered, it appeared that a number of elements were out of order based on their _____Properties_________. • In 1913 Henry Mosley discovered that each element contains a unique number of ___Protons________________. • By ...
