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Atomic Structure

Subject: 
Chemistry
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Physics
Chemistry
Atomic physics
Quantum chemistry
Rotational symmetry
Introductory physics
Quantum electrodynamics
Bohr model
Introduction to quantum mechanics
Atomic orbital
electron
Principal quantum number
Technology

The Wave Nature of Light All forms of NRG/Light have characteristic wavelengths (?) and frequency (?). Inversely related ? ? = c (the speed of light) Light visible to the naked eye exists as a tiny portion of the electromagnetic spectrum Max Planck Transfer of energy was not continuous Only came in certain values (quantized) ?E = h? h = Planck?s constant = 6.626 x 10-34 Js Packets of energy (quantum Albert Einstein Proposed that electromagnetic radiation was quantized and made up of a stream of particles Photons The dual nature of light ? = h/mv (deBroglie equation) Electrons as Waves Louis de Broglie (1924) Applied wave-particle theory to electrons electrons exhibit wave properties QUANTIZED WAVELENGTHS

Periodic Trends Lecture

Subject: 
Chemistry
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Chemistry
Physics
Quantum chemistry
Atomic physics
Chemical bonding
Periodic Table
ions
Ionization energy
Valence electron
Periodic trends
ion
Alkaline earth metal
Technology

* Chapter 7 Periodic Properties of the Elements John D. Bookstaver St. Charles Community College Cottleville, MO Lecture Presentation Development of Periodic Table Dmitri Mendeleev and Lothar Meyer independently came to the same conclusion about how elements should be grouped. Development of Periodic Table Mendeleev, for instance, predicted the discovery of germanium (which he called eka-silicon) as an element with an atomic weight between that of zinc and arsenic, but with chemical properties similar to those of silicon. Periodic Trends In this chapter, we will rationalize observed trends in Sizes of atoms and ions. Ionization energy. Electron affinity. Effective Nuclear Charge

How did plant and animal domestication set the scene for civilization?

Subject: 
World History
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Domestication
Hunting
Technology
Environment

How did plant and animal domestication set the scene for the emergence of civilization? The domestication of plants coincided with the cultivation of the use of fire. Environments dictated the choice of crops, which is why there are different types of food in all places of the world. The domestication of animals occured during the same time as that of plants. When global warming heightened, it transitioned hunter-gathering lifestyles to agricultural lifestyles, which historians call the Helocene Revolution (9000 BCE). With this new lifestyle came the emergence of civilization, and it increased the population from ten million in 5000 BCE to fifty to one hundred million by 1000 BCE.

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