Timeline of the atom from atomos to clouds
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Timeline of the Atom From “ Atomos to Clouds”. Democritus. 400 B.C.E. Proposed that matter was composed of tiny indivisible particles Based on thought not experimentation Greek: “ atomos ”. Aristotle. 350 B.C.E. 4 element theory Matter infinitely divisible

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Timeline of the Atom From “ Atomos to Clouds”

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Timeline of the atom from atomos to clouds

Timeline of the AtomFrom “Atomos toClouds”


Democritus

Democritus

  • 400 B.C.E.

  • Proposed that matter was composed of tiny indivisible particles

  • Based on thought not

    experimentation

  • Greek: “atomos”


Aristotle

Aristotle

  • 350 B.C.E.

  • 4 element theory

  • Matter infinitely divisible

  • All matter made of different amounts of the 4 elements


Alchemists

Alchemists

  • 500BCE to 1720

  • Mixture of science

    and mysticism.

  • Lab procedures were developed, but alchemists did not perform controlled experiments like true scientists.


Sir francis bacon

Sir Francis Bacon

  • 1620’s

  • Hypotheses based on evidence, experiments

  • Scientific Method

  • The birth of science as we know it


Benjamin franklin

Benjamin Franklin

  • 1700’s

  • Experiments with electricity

  • Arbitrarily decides positive and negative charge

  • Attraction between opposing charge


Antoine lavoisier

Antoine Lavoisier

  • 1777

  • Isolated “Elements” that could not be broken down further

  • Father of Modern Chemistry

  • Theorized how elements become compounds

  • Famous for parlor tricks


Charles augustin de coulomb

Charles Augustin de Coulomb

  • 1780’s

  • Some fluids repelled, some attracted

  • Idea of charge


John dalton

John Dalton

  • 1803

  • Water same Everywhere

  • Compounds happen in definite whole number ratios

  • Atomic Theory

  • Disproved Alchemy


Daltons atomic theory

Daltons Atomic Theory

Postulate 1

Postulate 2

All matter is made of atoms

A chemical reaction is

a rearrangement of atoms

All atoms of an element are identical

in mass and property

Compounds are formed of two or more

types of elements

Atoms are indivisible and indestructible

Postulate 3

Postulate 4

Postulate 5


Sir william crookes

Sir William Crookes

  • 1870’s

  • Cathode Ray Tube (CRT)

  • Later used to find electrons


Henri becquerel

Henri Becquerel

  • 1896

  • Accidentally discovered Radiation

  • Set up experiment on photo plates but was exposed before light hit them


Marie and pierre curie

Marie and Pierre Curie

  • 1898

  • Defined radiation as atoms breaking down and emitting parts spontaneously

  • Discovered many radioactive elements


Jj thomson

JJ Thomson

  • 1898

  • Discovered Crooke’s beam was negatively charged by deflecting with a magnet

  • Discovered the beam was particles by including paddlewheel


Jj thomson1

JJ Thomson

  • Plum Pudding Model

    • Raisin Bread Analogy


Max planck

Max Planck

  • 1900

  • Energy is emitted in small discrete amounts he called quanta

  • Planck’s constant


Albert einstein

Albert Einstein

  • 1905

  • Special Theory of Relativity

  • Particle Nature of Light


Robert milikan

Robert Milikan

  • 1910

  • Found Charge of e-

  • Oil Drop Experiment


Ernest rutherford

Ernest Rutherford

  • 1909 - 1911

  • Gold Foil Experiment

  • Plum Pudding?????


Gold foil experiment

Gold Foil Experiment

  • Experiment Animation


Rutherford model

Rutherford Model

  • Nuclear Model

    • dense, positive nucleus surrounded by negative electrons


Neils bohr

Neils Bohr

  • 1913

  • Bright-Line Spectrum

    • tried to explain presence of specific colors in H spectrum

  • Energy Levels

    • electrons can only exist in specific energy states


Neils bohr1

Neils Bohr

  • Bright-Line Spectrum

  • Planetary or Solar System Model

    • electrons move in circular orbits within specific energy levels


Louise debroglie

Louise DeBroglie

  • 1924

  • Research in Quantum Theory

  • Particle/Wave Duality

  • “Wavicle or Partave”


Erwin schrodinger

Erwin Schrodinger

  • 1926

  • Wave nature of e-

  • The beginning of Quantum Mechanical Model of aton

  • New Problems


Erwin schrodinger1

Erwin Schrodinger

  • Quantum mechanics

    • electrons can only exist in specified energy states

  • Electron cloud model

    • orbital: region around the nucleus where e- are likely to be found


Erwin schrodinger2

Erwin Schrodinger

Electron Cloud Model (orbital)

  • dots represent probability of finding an e-not actual electrons


Schrodinger s cat

Schrodinger’s Cat


James chadwick

James Chadwick

  • 1931

  • Finds mass of Proton

  • Irene Joliot Curie

  • 1931

  • Finds Neutron


Glen seaborg

Glen Seaborg

  • 1951

  • Transuranic Elements


Murray gell mann george zweig

Murray Gell-Mann & George Zweig

  • 1964

  • Particles in Protons

    & Neutrons

  • 6 types


Murray gell mann george zweig1

He

Murray Gell-Mann & George Zweig

less mass more mass

  • 3 quarks = 1 proton (2+, 1-) or 1 neutron (1+, 2-)


What does the future hold

What Does the Future Hold?


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