نتایج جستجو برای: periodic table

تعداد نتایج: 198946  

Journal: :Studies in Logic, Grammar and Rhetoric 2018

Journal: :Journal of Light & Visual Environment 2009

Journal: :European Journal of Inorganic Chemistry 2021

Cyclopentadienide (Cp) groups are among the most popular ligands in organometallic chemistry. Sterically demanding substitution patterns on Cp ring can have an important effect ligand properties and there many examples of metal complex which only stable isolatable with sterically ligands, carrying alkyl or aryl groups. Among these pentaisopropylcyclopentadienide is bulkiest pentaalkyl derivativ...

2013
Ayşe Eldem Fatih Başçiftçi

Visually impaired individuals cannot lead their lives as comfortable as others. Therefore, new applications are being developed every passing day in order to make their lives easier. In this study, an electronic and computer-aided audio device was developed with the aim of making the learning of the periodic table easier for the visually impaired. In this device, a board includes buttons for ea...

2018
Angela K. Wilson

T he periodic table continues to evolve, as it has since the publication of the first widely recognized periodic table by Dmitri Mendeleev in 1869. There have been over 700 versions of the table of elements to date [1], with elements regularly being added, filling empty blocks of the table. An example is the late 19th century addition of a new column (group) of elements, the noble gases, by Wil...

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