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The Atomic Theory (Niels Bohr (Danish, got PhD in physics at 25, Said the…
The Atomic Theory
Niels Bohr
Danish, got PhD in physics at 25
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Said that electrons jump to higher orbits by absorbing photons; these electrons are said to be "excited"
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Democritus
Originally came up with the concept of an atom. However, Aristotle shielded his ideas and the Atomic Theory would disappear for thousands of years,
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Called them "atomos", which means indivisible in Greek
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Metalloids
Like most nonmetals, pure silicon is a poor conductor of electric current. However, if a small amount of boron is mixed with the silicon, the mixture is a good conductor of electric current.
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JJ Thompson
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Use the Cathode Ray Tube experiment to discover atoms. It was a tube at low air pressure that contained both a cathode as well as an anode.
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An anode is a positively charged non metal plate that attracts negatively charged particles. A cathode is a negatively charged plate that attracts positively charged particles.
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Nonmetals
poor conductors of heat and electric current, except graphite…
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Ions are an atom or molecule with a net electric charge due to the loss or gain of one or more electrons
A cation is a positively charged ion, i.e. one that would be attracted to the cathode
An anion is a negatively charged ion, i.e. one that would be attracted to the anode
Metals
Are good conductors of heat and electric current
Are also solids at room temperature, except Hg
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