Atomic Theory Means there is a link on the page. Click on the image.

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Presentation transcript:

Atomic Theory Means there is a link on the page. Click on the image

John Dalton (1800) Pure elements consist of atoms. Atoms of an element are all the same for that element. (all gold atoms are the exact same) Atoms can be told apart by their atomic weights. Atoms unite to form chemical compounds. Atoms can neither be created or destroyed in chemical reaction.

J.J. Thomson (1850) Cathode Ray Tube Experiment Discovered negatively electrons Plum pudding model https://www.youtube.com/watch?v=XU8nMKkzbT8&feature=related

Ernest Rutherford (1905) Gold foil experiment Discovered that: Atoms are mostly empty space Atoms have a nucleus (positively charged) Electrons move around nucleus at distance Nuclear atom model https://www.youtube.com/watch?v=Q8RuO2ekNGw

Niels Bohr (1920) Electromagnetic Spectrum the entire spectrum, considered as a continuum, of all kinds of electric, magnetic, and visible radiation https://www.youtube.com/watch?v=cfXzwh3KadE

Waves Wavelength: distance from crest to crest Short wavelengths = higher energy Amplitude: distance from level of crest to level of trough wavelength amplitude

Waves Frequency: number of crest passages per unit time Higher frequency = higher energy https://www.youtube.com/watch?v=7Iv4GmyXsCQ

Electromagnetic Spectrum https://www.youtube.com/watch?v=wbbsbE2mQuA ROYGBV

Invisibility Cloak Infrared waves Object https://www.youtube.com/watch?v=oLbS3M4V7oI&feature=watch_response

Niels Bohr (1920) Studied energy emissions from hydrogen Continuous spectrum: all visible light waves present versus Bright line spectrum: certain (discrete number of) visible light waves present https://www.youtube.com/watch?v=QI50GBUJ48s

Niels Bohr (1920) Studied energy emissions from hydrogen Electrons can only exist on definite energy levels that are specific distances from the nucleus. Planetary model Draw arrows of energy

Current Model of Atom

Quantum Mechanical Model Mathematical model The model estimates the probability of finding an electron in a certain position https://www.youtube.com/watch?v=xqNSQ3OQMGI Denser area = higher chance of finding an electron