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229

Showing resources 1 to 20 of 229

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  • Bohr Atomic Model

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    Three concentric circles around the nucleus of a hydrogen atom represent principal shells. These are named 1 n, 2 n, and 3 n in order of increasing distance from the nucleus. An electron orbits in the shell closest to the nucleus, 1 n.

    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)

  • Hollow glass tube with roughly diamond shaped object in the center surrounded by glowing light. Caption: you get the characteristic color of this purplish-blue.

    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)

  • Plastic tube containing clear, pebble-like objects is attached to a larger tube. Caption: The gas is filling up a constant volume.

    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.

    (Source: DCMP)

  • Atoms

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    Points of light streaking toward a central point. Caption: Matter is made up of tiny particles called atoms.

    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.

    (Source: DCMP)

  • 1-Hydrogen

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    3D model of the atom Hydrogen

    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)

  • 79-Gold

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    3D model of the atom Gold

    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.

    (Source: Library Lyna)

  • 5-Boron

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    3D model of the atom Boron

    Boron is a chemical element with the symbol B and atomic number 5.

    (Source: Library Lyna)

  • 9-Fluorine

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    3D model of the atom Fluorine

    Fluorine is a chemical element with the symbol F and atomic number 9.

    (Source: Library Lyna)

  • 63-Europium

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    3D model of the atom Europium

    Europium is a chemical element with the symbol Eu and atomic number 63.

    (Source: Library Lyna)

  • 69-Thulium

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    3D model of the atom Thulium

    Thulium is a chemical element with the symbol Tm and atomic number 69.

    (Source: Library Lyna)

  • 70-Ytterbium

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    3D model of the atom Ytterbium

    Ytterbium is a chemical element with the symbol Yb and atomic number 70.

    (Source: Library Lyna)

  • 89-Actinium

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    3D model of the atom Actinium

    Actinium is a chemical element with the symbol Ac and atomic number 89.

    (Source: Library Lyna)

  • 27-Cobalt

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    3D model of the atom Cobalt

    Cobalt is a chemical element with the symbol Co and atomic number 27.

    (Source: Library Lyna)

  • 30-Zinc

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    3D model of the atom Zinc

    Zinc is a chemical element with the symbol Zn and atomic number 30.

    (Source: Library Lyna)

  • 42-Molybdenum

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    3D model of the atom Molybdenum

    Molybdenum is a chemical element with the symbol Mo and atomic number 42.

    (Source: Library Lyna)

  • 100-Fermium

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    3D model of the atom Fermium

    Fermium is a synthetic element with the symbol Fm and atomic number 100.

    (Source: Library Lyna)

  • 95-Americium

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    3D model of the atom Americium

    Americium is a synthetic radioactive chemical element with the symbol Am and atomic number 95.

    (Source: Library Lyna)

  • 96-Curium

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    3D model of the atom Curium

    Curium is a transuranic radioactive chemical element with the symbol Cm and atomic number 96.

    (Source: Library Lyna)

  • 34-Selenium

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    3D model of the atom Selenium

    Selenium is a chemical element with the symbol Se and atomic number 34. It is a nonmetal.

    (Source: Library Lyna)

  • 51-Antimony

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    3D model of the atom Antimony

    Antimony is a chemical element with the symbol Sb and atomic number 51. A lustrous gray metalloid.

    (Source: Library Lyna)

Collections

5

Showing collections 1 to 5 of 5

  • Chemistry

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    • Simulation

    A collection of Chemistry related resources

    A collection containing 67 resources, curated by Benetech

  • Elements

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    • 3D Model

    3D models and images of the entire periodic table of elements

    A collection containing 118 resources, curated by Library Lyna

  • Biology

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    Biology related concepts

    A collection containing 59 resources, curated by Benetech

  • PhET Simulations

    • Simulation

    A collection of simulations from PhET.

    A collection containing 15 resources, curated by Charles LaPierre

  • Animals

    • Video

    Resources to teach younger students about animals

    A collection containing 58 resources, curated by DIAGRAM Center