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Chemistry

QuestionAnswer
The idea of atoms were rejected by other Greek Philosophers like Aristotle Democritus
Atoms moved through empty space There are different kinds of atoms with different sizes & shapes The different properties of matter were a result of these differences Democritus
What did Democritus propose Proposed all matter is made up of indivisible particles He called them “Atomos”.
Each Element is composed of tiny indivisible particles called ATOMS ALL atoms of a given element are identical, atoms of a specific element is different from the atoms of other elements Dalton’s Atomic Theory of Matter
Atoms are neither created nor destroyed during Chemical reactions (law of conservation of mass as originally defined by Antoine Lavoisier in 1785) In a chemical reaction atoms are separated, combined or rearranged Dalton’s Atomic Theory of Matter
Different atoms combine in simple whole number ratios to form compounds Dalton’s Atomic Theory of Matter
In 1897 he discovers the electron J.J. Thomson
In 1899 Thomson proposed a new model of the atom This came to be Known as the “PLUM PUDDING” model of the atom
GOLD FOIL EXPERIMENT RUTHERFORD’s
Who named the core of a atom the nucleus RUTHERFORD’s
that most of the mass of the atom is concentrated in a very small core at the atom’s center RUTHERFORD’s
Indicated electrons occupy mostly empty space around the nucleus RUTHERFORD’s
To move from one orbit to the next they had to absorb or release very specific amounts of energy called “quantum“ NIELS BOHR
Electrons cannot reside between these orbits, representing specific energy levels . NIELS BOHR
therefore proposed the nucleus also contained another uncharged particle with same mass as a proton RUTHERFORD’s
Chadwick Performed Experiments that led to the discovery of the Neutron James Chadwick (1891
Created by: Fernando.Quezada
 

 



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