Periodic Table History Illustrated - Pavan Mohan

Periodic Table History Illustrated - Pavan Mohan

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  • In the beginning of the 19th century only 55 elements had been discovered. But little did anyone know, that this number would eventually double, and that chemistry would forever be revolutionized...
  • John Dalton, was one of the most important people during this time, as he put forth theories and laws that would eventually contribute to the modern day periodic table.  Born in the year 1766, in Britain, Dalton greatly enjoyed teaching young children and loved watching the weather. He in fact had a meteorological diary with over 200,000 observations!
  • Ah... the weather never fails to amaze me.
  • Aside from his passion for the climate, he also greatly enjoyed chemistry. One of his famous findings is referred to as Dalton's Law of Partial Pressures. His findings didn't stop there though...
  • Yes! Yes! The total pressure of a mixture of gasses can equal the sum of it's partial pressures of the components! I'm a genius!
  • He also proposed that each element had to have their own building blocks. He used the Law of conservation of mass to propose that each element had a unique atomic mass, as the sum of protons and neutrons would vary.  However in his time, the apparatus required to look inside an atom was not present, and so he was not aware of how elements had unique masses because of their internal structures.
  • Ah... "Ultimate Particles" that is the best name. 
  • In addition, he also gave a definition for chemical compounds, and theorized that a chemical reaction is a rearrangement of atoms.
  • What a strange man....
  • Combinations of two or more different types of atoms...
  • Dalton had also defined atoms as particles that cannot be separated, without inner space. He believed that atoms preserved their identities in all chemical reactions. Although his theory was adopted by many scientists, there were still numerous objections to his workings. Despite this he must still be commended greatly as he put forth great workings despite not having the apparatus required to do so.
  • I hope my thinking is right.... Indivisible and indestructible... atoms of an element are all identical like sparrows!
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