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Figure 2.6 (OpenStax, Biology 2e) caption: In 1913, Niels Bohrs developed the Bohr model in which electrons exist within principal shells. An electron normally exists in the lowest energy shell available, which is the one closest to the nucleus. Energy from a photon of light can bump it up to a higher energy shell, but this situation is unstable, and the electron quickly decays back to the ground state. In the process, it releases a photon of light.
(Source: OpenStax)
Using light as a probe, scientists found innovative ways to make inferences about the inner structure of the atom. In this unit, scientists discuss the change from believing the atom was a single indivisible particle to later understanding the atom is composed of subatomic parts. This new picture of matter lead to the development of the quantum model of the atom, as well as ways to identify traces of chemical elements, whether on earth, in the sun, or in a distant galaxy. Part of the series Chemistry: Challenges And Solutions.
(Source: DCMP)
Chemistry is the science of interacting particles and the various states of matter. Developing a better understanding of the atomic model through experiments with gases, scientists discovered the Ideal Gas Law, developed phase diagrams, and learned about the properties of supercritical fluids. Today's chemists are exploring new ways to control the interactions of atoms, with the goal of making better hydrogen-powered cars and new technologies for the long-term, underground storage of carbon dioxide to reduce greenhouse warming. Part of the series Chemistry: Challenges And Solutions.
What is an atom? It is the smallest particle of an element, and everything is made up of atoms. They consist of three basic particles: protons, electrons, and neutrons. The scientific community has experienced significant breakthroughs which have contributed to the understanding of atoms. Other topics covered include atomic number, atomic mass, Bohr model, electron cloud, and isotope.
Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table.
(Source: Library Lyna)
Gold is a chemical element with the symbol Au and atomic number 79, making it one of the higher atomic number elements that occur naturally. In a pure form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile trasition metal.
Boron is a chemical element with the symbol B and atomic number 5.
Fluorine is a chemical element with the symbol F and atomic number 9.
Europium is a chemical element with the symbol Eu and atomic number 63.
Thulium is a chemical element with the symbol Tm and atomic number 69.
Ytterbium is a chemical element with the symbol Yb and atomic number 70.
Actinium is a chemical element with the symbol Ac and atomic number 89.
Cobalt is a chemical element with the symbol Co and atomic number 27.
Zinc is a chemical element with the symbol Zn and atomic number 30.
Molybdenum is a chemical element with the symbol Mo and atomic number 42.
Fermium is a synthetic element with the symbol Fm and atomic number 100.
Americium is a synthetic radioactive chemical element with the symbol Am and atomic number 95.
Curium is a transuranic radioactive chemical element with the symbol Cm and atomic number 96.
Selenium is a chemical element with the symbol Se and atomic number 34. It is a nonmetal.
Antimony is a chemical element with the symbol Sb and atomic number 51. A lustrous gray metalloid.
Showing collections 1 to 5 of 5
A collection of Chemistry related resources
A collection containing 67 resources, curated by Benetech
3D models and images of the entire periodic table of elements
A collection containing 118 resources, curated by Library Lyna
Biology related concepts
A collection containing 59 resources, curated by Benetech
A collection of simulations from PhET.
A collection containing 15 resources, curated by Charles LaPierre
Resources to teach younger students about animals
A collection containing 58 resources, curated by DIAGRAM Center
