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He proposed that matter is composed of invisible particles called “atomos”.
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A conflict between Athens and Sparta for control of ancient Greece.
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Proposed that atoms are solid, indivisible spheres and that each element has atoms of a single, unique type. -
A series of conflicts in which Napoleon Bonaparte’s France fought against various European countries for control of Europe.
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Showed that electricity could cause chemical reactions, leading to later ideas that atoms contain charged particles.
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Found evidence of positively charged particles, leading to the understanding that atoms have an internal structure.
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Held in Athens, Greece, reviving the ancient Greek tradition of athletic competition.
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Proposed that atoms are a positively charged “pudding” with negatively charged electrons embedded like “plums.” -
Measured the charge of the electron, confirming its fundamental properties.
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Discovered the nucleus, showing that atoms have a dense central core surrounded by electrons. -
Electrons travel in specific energy levels around the nucleus, which helps explain the colors of light that atoms give off. -
A global war mainly in Europe, fought between the Allies and the Central Powers.
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A nine-day nationwide strike supporting coal miners, it involved millions of workers, but it ended without achieving its main goals.
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Proposed electrons exist in probabilistic “clouds” rather than fixed orbits. -
Showed that its impossible to know the exact position and speed of an electron
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Completed the nuclear model of the atom by identifying neutrons in the nucleus alongside protons. -
Saw Adolf Hitler and the Nazi Party gain power through economic hardship, nationalist propaganda, and political instability, culminating in Hitler becoming Chancellor in 1933.