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  2. Carbon - Wikipedia

    en.wikipedia.org/wiki/Carbon

    Carbon (from Latin carbo 'coal') is a chemical element; it has symbol C and atomic number 6. It is nonmetallic and tetravalent—meaning that its atoms are able to form up to four covalent bonds due to its valence shell exhibiting 4 electrons. It belongs to group 14 of the periodic table. [13] Carbon makes up about 0.025 percent of Earth's ...

  3. Carbon-based life - Wikipedia

    en.wikipedia.org/wiki/Carbon-based_life

    Carbon is the 15th most abundant element in the Earth's crust, and the fourth most abundant element in the universe by mass, after hydrogen, helium, and oxygen. Carbon's widespread abundance, its ability to form stable bonds with numerous other elements, and its unusual ability to form polymers at the temperatures commonly encountered on Earth ...

  4. List of educational video websites - Wikipedia

    en.wikipedia.org/wiki/List_of_educational_video...

    Videos and podcasts Free ? University of California: VideoLectures.NET: Multidisciplinary Free and open access educational video lectures repository Free ? VideoLectures.NET: Wondrium: Multidisciplinary Educational videos with expert-led courses, tutorials and documentaries Paid/Subscription ? Wondrium: YouTube EDU: Multidisciplinary Videos ...

  5. Carbon dioxide - Wikipedia

    en.wikipedia.org/wiki/Carbon_dioxide

    Carbon dioxide is the lasing medium in a carbon-dioxide laser, which is one of the earliest type of lasers. Carbon dioxide can be used as a means of controlling the pH of swimming pools, [141] by continuously adding gas to the water, thus keeping the pH from rising. Among the advantages of this is the avoidance of handling (more hazardous) acids.

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  7. Geochemistry of carbon - Wikipedia

    en.wikipedia.org/wiki/Geochemistry_of_carbon

    Carbon can be produced in stars at least as massive as the Sun by fusion of three helium-4 nuclei: 4 He + 4 He + 4 He --> 12 C. This is the triple alpha process.In stars as massive as the Sun, carbon-12 is also converted to carbon-13 and then onto nitrogen-14 by fusion with protons.

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  9. Bond length - Wikipedia

    en.wikipedia.org/wiki/Bond_length

    A table with experimental single bonds for carbon to other elements is given below. Bond lengths are given in picometers.By approximation the bond distance between two different atoms is the sum of the individual covalent radii (these are given in the chemical element articles for each element).

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