Atomic Theory power point cscope

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Information about Atomic Theory power point cscope
Education

Published on August 15, 2012

Author: FJHScience

Source: slideshare.net

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From Democritus to modern atomic theory

Atoms:Development of the Atomic Theory

Democritus 460 BC - Greek philosopher proposes the existence of the atom He pounded materials until he made them into smaller and smaller parts He called them atoma which is Greek for “indivisible”.

DemocritusHis Theory: All atoms:  Are small hard particles  Are made of a single material formed into different shapes and sizes  Are always moving, and they form different materials by joining together

John Dalton 1803 - British chemist; elements combine in specific proportions to form compounds Solid Sphere Model or Bowling Ball Model Proposed by John Dalton

John Dalton His Theory:  All substances are made of atoms that cannot be created, divided, or destroyed.  Atoms join with other atoms to make new substances.  Atoms of the same element are exactly alike, and atoms of different elements are different in mass and size.

J.J. Thomson 1897 - English chemist and physicist; discovered 1st subatomic particles Plum Pudding Model or Raisin Bun Model Proposed by J.J. Thomson

J.J. ThomsonHis Theory:  Atoms contain negatively charged particles called electrons and positively charged matter.  Created a model to describe the atom as a sphere filled with positive matter with negative particles mixed in  Referred to it as the plum pudding model

Ernest Rutherford 1912 - New Zealand physicist discovered the nucleus Nuclear Model Proposed by Ernest Rutherford

Ernest RutherfordHis Theory:  Small, dense, positively charged particle present in nucleus called a proton  Electrons travel around the nucleus, but their exact places cannot be described.

Niels Bohr 1913 - Danish physicist; discovered energy levels Bohr Model or Planetary Model Proposed by Niels Bohr

Niels BohrHis Theory:  Electrons travel around the nucleus in definite paths and fixed distances.  Electrons can jump from one level to a path in another level.

QuickTime™ and a decompressor Erwin Shrodingerare needed to see this picture.  1924 - Austrian physicist; developed the electron cloud model Electron Cloud Model Proposed by Erwin Schrodinger

Erwin Shrodinger QuickTime™ and a decompressorare needed to see this picture. His Theory:  The exact path of electrons cannot be predicted.  The region referred to as the electron cloud, is an area where electrons can likely be found.

James Chadwick 1932 - English physicist; discovered neutrons His Theory:  Neutrons have no electrical charge.  Neutrons have a mass nearly equal to the mass of a proton.  Unit of measurement for subatomic particles is the atomic mass unit (amu).

Modern Theory of the Atom Atoms are composed of three main subatomic particles: the electron, proton, and neutron. Most of the mass of the atom is concentrated in the nucleus of the atom. QuickTime™ and a decompressor are needed to see this picture.

Modern Theory of the Atom The protons and neutrons are located within the nucleus, while the electrons exist outside of the nucleus. In stable atoms, the number of protons is equal to the number of electrons. QuickTime™ and a decompressor are needed to see this picture. Sodium Atom (Na)

Modern Theory of the Atom The type of atom is determined by the number of protons it has. The number of protons in an atom is equal to the atomic number. QuickTime™ and a QuickTime™ and a decompressor decompressor are needed to see this picture. are needed to see this picture.

Modern Theory of the Atom The sum of the number of protons and neutrons in a particular atom is called the atomic mass. Valence electrons are the outermost electrons. QuickTime™ and a QuickTime™ and a decompressor decompressor are needed to see this picture. are needed to see this picture.

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