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How Do Atoms Change Over Time

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Look around, animals, tables, pens, all have one thing in common. They each are made of matter and matter is made of atoms (OI). The atom is the basic building block of all matter. It is the smallest unit of all matter. Every solid, liquid, gas, and plasma is composed of atoms. Scientific ideas about its structure have changed over time. Over time different scientist, chemists, philosophers and physicists have changed the structure of the atom over time.
Atoms were first proposed in 450 BCE by Ancient Greek philosophers Leucippus and Democritus. They thought that matter is made of atoms (Doc.1). Then later, in 1911, physicist Ernest Rutherford proved that atoms were made of smaller particles, concluding they had a positively charged nucleus
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Today, a very knowledgable man that goes by the name Neil Bohr has come up with a new and improved idea about the atomic model. Neil Bohr was born on October 7, 1885, in Denmark, Niels Bohr went on to become an accomplished physicist who came up with this new revolutionary theory on atomic structures. Ernest Ruthfords believed he knew the true meaning behind the atomic model in 1911. He believed that the positively charged nucleus was surrounded with negative charged electrons which circulate at some distance in the light. Bohr has proposed that electrons are arranged in circular shells around the nucleus called orbits.

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