Atom - The smallest unit of matter that makes up all elments, Atomic Mass - The mass of the atom , Atomic Number - Number of protons; used to organize the modern Periodic Table, Dalton - Scientist who said that all matter is made of atoms. Organized 20 elements by how heavy they were compared to each other, Johann Döbereiner - Scientist who grouped elements into triads with similar properties, Triads - Groups of three elements with similar properties, Law of Octaves - Idea that element properties repeat every eight elements, John Newlands - Scientist who developed the law of octaves and the idea of groups, Dmitri Mendeleev - Father of the Modern periodic Table., Henry Moseley - Scientist who recognized that the elements in the Periodic Table should be arranged by their atomic numbers, Periodic Table - A chart that organizes elements by atomic number and properties, Groups - Vertical columns in the Periodic Table. Elements share similar properties, Periods - Horizontal Rows in the Periodic Table,

History of the Periodic Table

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