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Atomic theory Essay Examples

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Chemistry- The Modern Atomic Theory

This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) In an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect? bright red light…

Chemistry Exam 3 (Atomic Theory)

The wavelength of some green light is 530.0 nm. What is the frequency of this green light? 5.66 x 10^14 hz Microwave radiation vs. UV radiation Which has a longer wavelength? Which has a greater frequency? Which has greater energy? Microwave UV UV Microwave ovens emit microwave energy with a wavelength of 12.1 cm. What…

Scientists Who Contributed to Atomic Theory

John Dalton Founded basis for atomic theory. Atomic theory: 1. Elements are made of atoms 2. Atoms can’t be divided 3. Atoms can combine to form compounds 4. Atoms of a given element are identical. 5. Atoms are rearranged in chemical reactions William Crookes Invented the Crookes cathode ray tube around 1875 J.J. Thomson Proved…

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scientists and what they did for atomic theory

what did Democritus and Leucippus do? natural world consists of atomos and void what did Dalton do? formed a basis for the atomic theory what did Mendeleev do? developed a periodic table with 63 elements what did J.J. thomson do? discovered the electron what did Robert Millikan do? determined the charge and mass of an…

Contributions to the Atomic Theory

Alchemists european scientists, 800-900 years ago, in Europe, developed into what is now modern chemistry, started to catalog elements, tried to change ordinary metals in to gold Democritus ancient greek philosopher; everything is made of atoms; can’t be created, destroyed, or divided, between atoms is empty space; coined the term atomus John Dalton first explanation…

Development of the Atomic Theory

Democritus He named the atom for the Greek word atomos meaning “indivisible” in 450 B.C. He originated the idea that all matter is made of some elemental particle. John Dalton In 1803, he revived the atomic theory of matter. He stated 4 postulates: • Each element is composed of extremely small particles called atoms. •…

Atomic Theory – People & Contributions

Democritus (400 BC) Greek philosopher – first description of an “atom” John Dalton (1803) English chemist/physicist – Dalton’s Atomic Theory Johannes Rydberg (1888) Swedish physicist – Rydberg formula which predicts wavelengths of light emitted from e- changing energy levels in an H atom J.J Thomson (1897) English physicist- discovered the electron and the charge/mass ratio…

Atomic Theory Timeline

Atomos Democratus, 460 b.c. Billiard Ball Model John Dalton, 1808 Plum Pudding Model J.J. Thomson, 1904 Planetarium Model Ernest Rutherford, 1911 Bohr Model Niel Bohr, 1913 Refined Bohr Model Niel Bohr, 1920’s Electron Cloud Model Erwin Schrödinger, 1930’s New Quantum Model Albert Einstein, 1930’s

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