Atomic History, Mo and Josh
Category: Other
Updated: 2 Oct 2017
Chemistry Project
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Created byMohammed Ahmed
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Events
Democritus was born;
In Abdera, GreeceDemocritus dies;
In Abdera, GreeceDemocritus discovers atoms
He thought the world, including human beings, is composed of very small particles called "Atomos"All matter consists of small particles called atoms
-Atoms are indestructible
-Atoms are solid but invisible
-Atoms are homogeneous
-Atoms differ in size, shape, mass, position, and arrangement
-Solids are made of small pointy, atoms
-liquids are made of large round atoms
-oils are made of very fine, small atoms that can slip past each otherJohn Dalton was born;
Cumberland, EnglandJohn Dalton dies;
In Manchester, EnglandJohn Dalton discovers atoms
He believed every form of matter was made up of small individual particlesExperimented on gases and atmospheric pressuresThe tiny particles were called atomos
-Believed that atoms of different elements could be identified by their differing atomic weights
-Atoms cannot be created or destroyedJJ Thompson was born
In Cheetham Hill, Manchester, United KingdomJJ Thompson dies
Cambridge, United KIngdomDiscovered the idea of the electron of an atomExperimented with cathode ray tube: an electrical current was passed through the tube which made a stream of particles glow showing there was something there-Electrons have a very large charge for their mass
-Electrons have a negative charge
-Electrons are extremely smallRobert Millikan was born
In Morrison, IllinoisRobert Millikan dies
In San Marino, CaliforniaHe discovers the charge of an electron, or the elementary chargeExperimented with the Oil drop: drop oil between two electrodes, measure force of droplets passing through the electrical field and the field itself, able to determine the charge of an electronThe elementary charge equaled 1.5924(17) x 10^-19 Coulombs (C)
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.Ernest Rutherford was born
In Brightwater, New EnglandErnest Rutherford dies
In Cambridge, United KingdomRutherford discovers the nucleus, proton, and alpha/beta particlesExperimented with Gold foil: fired a beam of alpha particles through a piece of gold foil and watched as it passed through and some particles that deflected the straight path.Atoms have a vast amount of empty space that allows any particle to pass through them
.Niels Bohr is born
In Copenhagen, DenmarkNiels Bohr dies
In Copenhagen, DenmarkDiscovered the electron and constructed the famous Bohr modelBohr Model: showed the atom as a positive charged nucleus surrounded by orbiting electrons.-Electrons move around the nucleus in orbits.
-Energy in atoms is quantized
.Werner Heisenberg was born
In Wurzburg, GermanyWerner Heisenberg dies
In Munich, GermanyHeisenberg Discovered a way to formulate quantum mechanics in term of matricesUncertainty Principle: states that the more precisely the position of some particle is determined, the less precisely its momentum can be known, and vice versa.-Absolute causal determinism is impossible
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