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  2. Carbon group - Wikipedia

    en.wikipedia.org/wiki/Carbon_group

    The carbon group is a periodic table group consisting of carbon (C), silicon (Si), ... element that may have a few noble gas-like properties, though it is still most ...

  3. 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 ...

  4. Allotropes of carbon - Wikipedia

    en.wikipedia.org/wiki/Allotropes_of_carbon

    The carbon atoms are in the same locations as the silicon and aluminum atoms of the mineral sodalite. The space group, I 4 3m, is the same as the fully expanded form of sodalite would have if sodalite had just silicon or just aluminum. [30] bct-carbon: Body-centered tetragonal carbon was proposed by theorists in 2010. [31] [32]

  5. Group (periodic table) - Wikipedia

    en.wikipedia.org/wiki/Group_(periodic_table)

    In the periodic table of the elements, each column is a group. In chemistry , a group (also known as a family ) [ 1 ] is a column of elements in the periodic table of the chemical elements . There are 18 numbered groups in the periodic table; the 14 f-block columns, between groups 2 and 3, are not numbered.

  6. Atomic carbon - Wikipedia

    en.wikipedia.org/wiki/Atomic_carbon

    ), atomic carbon and its adducts of Lewis bases, such as water, also have Brønsted–Lowry basic character. Atomic carbon's conjugate acid is λ 2-methylium (CH +). H 3 O + + C ⇌ H 2 O + CH + Aqueous solutions of adducts are however, unstable due to hydration of the carbon centre and the λ 2-methylium group to produce λ 2-methanol (CHOH ...

  7. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    Elements in the same group tend to show similar chemical characteristics. Vertical, horizontal and diagonal trends characterize the periodic table. Metallic character increases going down a group and from right to left across a period. Nonmetallic character increases going from the bottom left of the periodic table to the top right.

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  9. Carbonyl group - Wikipedia

    en.wikipedia.org/wiki/Carbonyl_group

    For organic chemistry, a carbonyl group is a functional group with the formula C=O, composed of a carbon atom double-bonded to an oxygen atom, and it is divalent at the C atom. It is common to several classes of organic compounds (such as aldehydes , ketones and carboxylic acids ), as part of many larger functional groups.