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176

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  • Helium Atomic Diagram

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    Diagram of a helium atom, showing two electrons in a circular orbit around a cluster of two neutrons and two protons.

    Diagram of a helium atom. Design modalities for the image include braille with and without labels, print with and without labels in greyscale, color, and texture.

    (Source: Benetech)

  • Lithium Atomic Diagram

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    Diagram of a lithium atom, showing three electrons in a circular orbit around a cluster of three neutrons and three protons.

    Diagram of a lithium atom. Design modalities for the image include braille with and without labels, print with and without labels in greyscale, color, and texture.

    (Source: Benetech)

  • Hydrogen Atomic Diagram

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    Diagram of a hydrogen atom, showing one electron in a circular orbit around a single proton.

    Diagram of a hydrogen atom. Design modalities for the image include braille with and without labels, print with and without labels in greyscale, color, and texture.

    (Source: Benetech)

  • 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)

  • Atom Diagram

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    This illustration shows that, like planets orbiting the sun, electrons orbit the nucleus of an atom. The nucleus contains two neutrally charged neutrons, and two positively charged protons represented by spheres. A single, circular orbital surrounding the nucleus contains two negatively charged electrons on opposite sides.

    Figure 2.2 (OpenStax, Biology 2e) caption: Elements, such as helium, depicted here, are made up of atoms. Atoms are made up of protons and neutrons located within the nucleus, with electrons in orbitals surrounding the nucleus.

    (Source: OpenStax)

  • Oxygen Atoms

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    Two oxygen atoms are shown side-by-side. Each has six valence electrons, two that are paired and two that are unpaired. An arrow indicates that a reaction takes place. After the reaction, the four unpaired electrons join to form a double bond. This double bond can also be depicted by an equal sign between two Os.

    Figure 2.10 (OpenStax, Biology 2e) caption: A double bond joins the oxygen atoms in an O2 molecule.

    (Source: OpenStax)

  • 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)

  • Illustration of an atom showing the nucleus and orbiting electrons. Caption: has a maximum number of electrons it can hold.

    It's called a theory, but if we have never seen an atom, how did anyone ever come up with an idea that is so central to science. Shows how all the pieces of the puzzle have come together at the same time, explaining the structure of the atom and the periodic table.

    (Source: DCMP)

  • Dark background with a small central ball of light surrounded by four irregularly placed orbiting streaks of light. Caption: And Rutherford now also knew that the atom had structure,

    Professor Jim Al-Khalili shows that in our quest to understand the tiny atom, we unraveled the mystery of how the entire universe was created. It's a story with dramatic twists and turns, taking in world-changing discoveries like radioactivity, the Atomic Bomb, and the Big Bang Theory. All this forms part of an epic narrative in which the greatest brains of the 20th century competed to answer the biggest questions of all-why are we here and how were we made?

    (Source: DCMP)

  • Close up of bones in a human body with a bright point of light at one of the joints. Caption: So they were named "x-rays."

    As scientists delved deep into the atom, into the very heart of matter, they unraveled nature's most shocking secrets. They had to abandon everything they believed in and create a whole new science, which today underpins the whole of physics, chemistry, biology, and maybe even life itself. Tells a story of great geniuses, like Albert Einstein and Werner Heisenberg who were driven by their thirst for knowledge and glory. It's a story of false starts and conflicts, ambition, and revelation, a story which leads us through some of the most exciting and exhilarating ideas ever conceived of by the human race.

    (Source: DCMP)

  • Out of focus image of a spherical object surrounded in glowing light. Caption: Then, as scientists explored the nucleus,

    Explores how studying the atom forced us to rethink the nature of reality itself, encounters ideas that seem like they're from science fiction but in fact are a central part of modern science, and discovers there might be parallel universes in which different versions of us exist and finds out that empty space isn't empty at all, but seething with activity. The world we think we know, the solid, reassuring world of our senses, turns out to be a tiny sliver of an infinitely weirder and more wonderful universe than we had ever conceived of in our wildest fantasies.

    (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)

  • Head and body of a large brown and tan patterned snake. Caption: Tim: We're not too worried about the bite.

    Dr. Chris gets wrapped up in his work – all two hundred pounds of it!  Atomic Betty has stopped feeding, and this reticulated python does not want to take her vitamins. Marie the pampered Pomeranian swallows some string, leaving her owner’s stomach in knots. And Bruno the terrier is accidentally run over by his owner. Can Dr. Chris save his leg?

    (Source: DCMP)

  • The periodic table of elements. A color-coded grid with letters representing each element. Caption: Each row of the table represents a pattern of chemical properties

    As scientists discovered more and more chemical elements, they began developing systems to organize the elements by their chemical properties, leading to the modern periodic table. Through its organization, the periodic table makes clear the underlying chemical and physical trends among the elements. The periodic table is being continually updated even today as scientists strive to create new elements in laboratories. Part of the series Chemistry: Challenges And Solutions.

    (Source: DCMP)

  • Person in a science lab working with complex machinery. Caption: There is almost no limit to the ways we transmute matter.

    Students will trace the history of chemistry and study accounts of how chemistry developed from a practical discipline into a science. This episode also presents a current, real-life application of chemistry by illustrating the process of the refining and purifying pure silicon for advanced electronics, such as cell phones and solar cells. Part of the Chemistry: Challenges and Solutions Series.

    (Source: DCMP)

  • Person speaking. Caption: between one and one hundred nanometers.

    Nano expert Oliver Brand from Georgia Tech University discusses the difference between nanoscale and atomic scale. Part of the “Ask a Scientist” series.

    (Source: DCMP)

  • Helium

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    Illustration of the Helium atom comprising of 2 positively charged protons an d 2 Neutrons in the Nucleus, with two orbiting negatively charged electrons.

    Remixed from Customizable Atom Delux by roman_hegglin. Helium is a chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the elements.

    (Source: OpenStax)

  • One central atom with two smaller atoms each attached to an electron on the outer ring of the central atom. Caption: covalently bonded to one oxygen atom,

    Biology is the study of life. It encompasses the cellular basis of living things, the energy that underlies the activities of life, and the genetic basis for inheritance in organisms. Topics covered include the smallest components of living things: atoms, molecules, organelles, and cells. Part of the "Biology" series.

    (Source: DCMP)

  • Ionic Compound

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    A sodium and a chlorine atom sit side by side. The sodium atom has one valence electron, and the chlorine atom has seven. Six of chlorines electrons form pairs at the top, bottom and right sides of the valence shell. The seventh electron sits alone on the left side. The sodium atom transfers its valence electron to chlorines valence shell, where it pairs with the unpaired left electron. An arrow indicates a reaction takes place. After the reaction takes place, the sodium becomes a cation with a charge of plus one and an empty valence shell, while the chlorine becomes an anion with a charge of minus one and a full valence shell containing eight electrons.

    Figure 2.11 (OpenStax, Biology 2e) caption: In the formation of an ionic compound, metals lose electrons and nonmetals gain electrons to achieve an octet.

    (Source: OpenStax)

Collections

4

Showing collections 1 to 4 of 4

  • 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

  • Chemistry

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    • Simulation

    A collection of Chemistry related resources

    A collection containing 67 resources, curated by Benetech

  • PhET Simulations

    • Simulation

    A collection of simulations from PhET.

    A collection containing 15 resources, curated by Charles LaPierre

  • Biology

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    Biology related concepts

    A collection containing 59 resources, curated by Benetech