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12/17/19
Born- 460 B.C.E Abdera, Greece
Died- 370 B.C.E ???, Greek
Discovery date - early 400 B.C.E
What did he discovered:
-He developed the concept of the atom,
-The word atom is the greek word for 'indivisible'.
-Democritus believed that everything in the universe was made up of atoms, which were microscopic and indestructible.
Model:
-Grounded up materials in his pestle and mortar until he had reduced them to smaller and smaller particles
-He is also known as The Laughing Philosopher as he was often cheerful while at work.
Born: June 19, 384 BC, Stagira, Greece
Died: March 7, 322 BC, Chalcis, Greece
Discovery date: 332 BCE
What he believed:
-Rejected Democritus Idea of Atomic Theory
-Believed that everything consisted of 4 elements
-Fire, water, earth, and air.
Model:
air which was light, earth which was cool and heavy, water which was wet, fire which was hot
-Aristotle theory was accepted while Democritus theory was disregarded for more than 2000 years.
-There was another element I didn't mention which was Aether which is decided as "a divine substance which made up the stars and planets."
In 338 BCE, He started tutoring son of King Phillip II. The boy who was 13 years old would grow up to be known as Alexander The Great
Lived in Eaglesfield and Manchester
Born: December 18, 1856, Cheetham Hill, Manchester, United Kingdom
Died: August 30, 1940, Cambridge, United Kingdom
Discovery date: 1897
What he discovered:
-First discovered Electrons
-originally called electrons "corpuscles"
-First evidence of Isotope
-First discovery of subatomic particle
Model:
-The Cathode ray tubes Experiment showed that all atoms contain tiny negatively charged subatomic particles or electrons.
-The Plum Pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."
Born: March 22, 1868, Morrison, IL
Died: December 19, 1953, San Marino, CA
What he discovered: 1909
-Determined the mass and charge of the electron
Model:
The Oil Drop Experiment
-They determined the mass and charge of the electron by measuring the effect of an electric field on very small oil droplets. The oil was charged and dropped between two metal electrodes by balancing downward gravitational force with upward drag and electric forces.
- Charge is quantized.
He worked on photoelectric effect (the emission of electrons or other carriers when light hits the material
Lived in Canada, Nelson, and England
Born: October 7, 1885, Copenhagen, Denmark
Died: November 18, 1962, Carlsberg, Copenhagen, Denmark
Discovery date: 1913
What he discovered:
-Discovered sets of number of electron orbit
-Electron orbit around the atomic nucleus
-Electrons can only move from one to another at one time either being absorbed or emitted called quanta
-discovered The number of electrons in the outer orbit determines the properties of an element.
-foundational contributions to understanding atomic structure and quantum theory
Model:
The Bohr model shows the atom example as a small, positively charged nucleus surrounded by orbiting electrons.
He was awarded multiple noble prize from discoveries ranging from how cells adapt to changes in levels of oxygen to our ability to fight global poverty.