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Thought if you break a piece of matter again and again, it would at some time stop, and end with a small piece of matter.
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442 B.C.
Said everything is composed of atoms.
They are solid, indestructable, and homogeneous.
They are different sizes and shapes.
Changing in groupings of atoms, not the atom itself. -
Named Oxygen.
Proposed law of conservation of mass and the combustion theory. -
Proposed law of constant composition.
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Formed atomic theory.
Named Thallium in 1861.
First to identify Helium in 1895.
Said all matter is composed of atoms.
Each element has identical atoms.
Can't be created, divded into smaller particles, or destroyed. -
Proposed Avogadro's hypothesis.
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He was killed by John Wilkes Booth, when he was at the theater with his wife.
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Identified that cathrode rays travel in straight lines.
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Discovered radio-activity.
Discovered some chemicals spontaneously decompose and give off penetrating rays. -
Discovered electron.
1904- suggested model of the atom. -
Studied Uranium and Thorium.
Called the spontaneous decay process radioactivity. -
Used idea of quanta to explain glowing matter.
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48 mile ship canal, that joins the Atlantic Ocean.
1904-1914 -
7 year study on the electron; discovered its charge.
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Won the Nobel Prize
Studied charged alpha particles.
In 1920 proposed exsistence of the 3rd atomic particle, neutrons. -
Discovered energy of x-rays increased in a linear fashion with each element in the table.
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Stimulated emission-physical process that makes possible the maser and the laser; same frequency.
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After the Japenese bombed Pearl Harbor; we got mad and joined
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Explained atomic structures.
Atomic model built up of successive orbital shells of electrons. -
Said electrons had a dual nature- similar to both particles and waves.
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First to describe atoms.
Proposed principle of indeterminacy (can't know the position and velocity of an atom). -
Jacob Schick (born in Ottumwa, Iowa)
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Introduced term 'wave mechanics'.
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Used alpha particles to discover a neutral atomic particle.
The nucleus also contains a neutron; led to atomic bomb. -
Japenese were trying to prevent us from interfering with their army.
We were attacked by 353 Japenese. -
Affects the immune system.
Discovered by the US Centers for Diesease Control in 5 homosexual men, in LA. -
Started in 1946
Between Communists and the Western World -
Didn't actually make a person; it was just research
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2 bombers crashed into the World Trade Center; suicide attacks
2 other bombers crashed in other places around the country
Start of the Iraq War (2001-present) -
In the Atlantic
One of 5 deadliest hurricanes
At least 1,836 people died
Hit New Orleans the hardest