Author Topic: The periodic table  (Read 597 times)

hubag bohol

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The periodic table
« on: September 19, 2012, 05:54:41 AM »
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  • ...than to speak out and remove all doubt." - Abraham Lincoln


    hubag bohol

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    Re: The periodic table
    « Reply #1 on: September 19, 2012, 05:55:39 AM »
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  • The periodic table is a tabular display of the chemical elements, organized on the basis of their atomic numbers, electron configurations, and chemical properties. Elements are presented in increasing atomic number. The main body of the table is a 18 × 7 grid, and elements with the same number of valence electrons are kept together in groups, such as the halogens and the noble gases. There are four distinct rectangular areas or blocks. The f-block is usually not included in the main table, but rather is floated below, as an inline f-block would often make the table impractically wide. Using periodic trends, the periodic table can help predict the properties of various elements and the relations between properties. As a result, it provides a useful framework for analyzing chemical behavior, and is widely used in chemistry and other sciences.

    Although precursors exist, the current table is generally credited to Dmitri Mendeleev, who developed it in 1869 to illustrate periodic trends in the properties of the then-known elements; the layout has been refined and extended as new elements have been discovered and new theoretical models developed to explain chemical behavior. Mendeleev's presentation also predicted some properties of then-unknown elements expected to fill gaps in his arrangement; most of these predictions were proved correct when those elements were discovered and found to have properties close to the predictions.

    All elements from atomic numbers 1 (hydrogen) to 118 (ununoctium) have been synthesized. Of these, all up to and including californium exist naturally; the rest have only been artificially synthesised in laboratories. Production of elements beyond ununoctium is being pursued, with the question of how the periodic table may need to be modified to an extended form to accommodate these elements being a matter of ongoing debate. Numerous synthetic radionuclides of naturally occurring elements have also been produced in laboratories. --Wiki
    ...than to speak out and remove all doubt." - Abraham Lincoln


    hubag bohol

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    Re: The periodic table
    « Reply #2 on: September 19, 2012, 05:58:07 AM »
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  • Bunpei Yorifuji


     8)
    ...than to speak out and remove all doubt." - Abraham Lincoln



    islander

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    Re: The periodic table
    « Reply #5 on: September 19, 2012, 07:03:25 PM »
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  • sigon sa akong minugbong naaninaw, mapa ni ug asa gilubong ang yamashita treasure.  peke diay tong naangkon ni marcos. ;D


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    islander

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    Re: The periodic table
    « Reply #6 on: September 19, 2012, 07:04:12 PM »
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  • gamiti ug telescope nang hulagway, di ba naa dinhay periodic table. ;D
    Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

    BolBuhol

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    Re: The periodic table
    « Reply #7 on: September 20, 2012, 08:23:41 AM »
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  • Ano gid man ini nga hinanggaw haw? Sikrit misids? ;D






    namit gid na tibol haw.

     

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