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  2. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows (" periods ") and columns (" groups "). It is an icon of chemistry and is widely used in physics and other sciences. It is a depiction of the periodic law, which states that when the elements are arranged in order ...

  3. DNA - Wikipedia

    en.wikipedia.org/wiki/DNA

    The four bases found in DNA are adenine (A), cytosine (C), guanine (G) and thymine (T). These four bases are attached to the sugar-phosphate to form the complete nucleotide, as shown for adenosine monophosphate. Adenine pairs with thymine and guanine pairs with cytosine, forming A-T and G-C base pairs. [17] [18]

  4. History of the periodic table - Wikipedia

    en.wikipedia.org/wiki/History_of_the_periodic_table

    This is an accepted version of this page This is the latest accepted revision, reviewed on 9 October 2024. Development of the table of chemical elements The American chemist Glenn T. Seaborg —after whom the element seaborgium is named—standing in front of a periodic table, May 19, 1950 Part of a series on the Periodic table Periodic table forms 18-column 32-column Alternative and extended ...

  5. Types of periodic tables - Wikipedia

    en.wikipedia.org/wiki/Types_of_periodic_tables

    Theodor Benfey's arrangement is an example of a continuous (spiral) table. First published in 1964, it explicitly showed the location of lanthanides and actinides.The elements form a two-dimensional spiral, starting from hydrogen, and folding their way around two peninsulas, the transition metals, and lanthanides and actinides.

  6. DNA and RNA codon tables - Wikipedia

    en.wikipedia.org/wiki/DNA_and_RNA_codon_tables

    A codon tablecan be used to translate a genetic codeinto a sequence of amino acids. [1][2]The standard genetic code is traditionally represented as an RNAcodon table, because when proteinsare made in a cellby ribosomes, it is messenger RNA(mRNA) that directs protein synthesis. [2][3]The mRNA sequence is determined by the sequence of genomic DNA.[4]

  7. Carbon group - Wikipedia

    en.wikipedia.org/wiki/Carbon_group

    synthetic element. The carbon group is a periodic table group consisting of carbon (C), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), and flerovium (Fl). It lies within the p-block. In modern IUPAC notation, it is called group 14. In the field of semiconductor physics, it is still universally called group IV.

  8. Phosphorus - Wikipedia

    en.wikipedia.org/wiki/Phosphorus

    4 tetrahedron is also present in liquid and gaseous phosphorus up to the temperature of 800 °C (1,500 °F; 1,100 K) when it starts decomposing to P 2 molecules. [12] The nature of bonding in this P 4 tetrahedron can be described by spherical aromaticity or cluster bonding, that is the electrons are highly delocalized.

  9. Rubidium - Wikipedia

    en.wikipedia.org/wiki/Rubidium

    Although rubidium is monoisotopic, rubidium in the Earth's crust is composed of two isotopes: the stable 85 Rb (72.2%) and the radioactive 87 Rb (27.8%). [22] Natural rubidium is radioactive, with specific activity of about 670 Bq /g, enough to significantly expose a photographic film in 110 days.

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