Results 11 to 20 of about 312,132 (253)

Understanding Periodic and Non-periodic Chemistry in Periodic Tables [PDF]

open access: yesFrontiers in Chemistry, 2021
The chemical elements are the “conserved principles” or “kernels” of chemistry that are retained when substances are altered. Comprehensive overviews of the chemistry of the elements and their compounds are needed in chemical science. To this end, a graphical display of the chemical properties of the elements, in the form of a Periodic Table, is the ...
Changsu Cao   +5 more
openaire   +3 more sources

ANÁLISE DA ABORDAGEM HISTÓRICA PARA A TABELA PERIÓDICA EM LIVROS DE QUÍMICA GERAL PARA O ENSINO SUPERIOR USADOS NO BRASIL NO SÉCULO XX

open access: yesQuímica Nova, 2015
The aim of this paper was to analyze the historical approaches to the periodic table in general chemistry textbooks used in Brazilian universities in the twentieth century.
Helena S. A. Leite, Paulo A. Porto
doaj   +1 more source

Molecular Classification of Pesticides Including Persistent Organic Pollutants, Phenylurea and Sulphonylurea Herbicides

open access: yesMolecules, 2014
Pesticide residues in wine were analyzed by liquid chromatography–tandem mass spectrometry. Retentions are modelled by structure–property relationships.
Francisco Torrens, Gloria Castellano
doaj   +1 more source

The St Andrews Periodic Table Wallchart and its Use in Teaching

open access: yesSubstantia, 2019
An early surviving copy of a periodic table of the elements wallchart is described and it is compared with other early versions of the periodic table. The status of chemistry teaching in St Andrews at the time and particularly the lectures of Professor ...
R. Alan Aitken, M. Pilar Gil
doaj   +1 more source

A MODIFICATION OF THE PERIODIC TABLE. [PDF]

open access: yesJournal of the American Chemical Society, 1911
n ...
openaire   +2 more sources

The Periodic Table in Croatia [PDF]

open access: yesKemija u Industriji, 2011
The Croatian (Yugoslav) Academy of Sciences and Arts was the first academy to elect D. I. Mendeleev as its honorary member (1882), whereas the periodic table of the elements has been taught regularly at the Zagreb University since 1888.
Raos, N.
doaj  

From Permutation Patterns to the Periodic Table [PDF]

open access: yesریاضی و جامعه, 2023
(The above abstract has been extracted by the translator from the original article (L. Pudwell, From Permutation Patterns to the Periodic Table, Notices of the American Mathematical Society, 67 994–1001.))Abstract: Permutation patterns is a burgeoning ...
Saeid Alikhani, Maryam Safazadeh
doaj   +1 more source

The Periodic Table and Kinetics?

open access: yesCHIMIA, 2019
Mendeleev in his first publication ordered the chemical elements following an apparent periodicity of properties such as atomic volume and valence. The reactivity of the elements was only studied systematically many years later.
Lothar Helm, André E. Merbach
doaj   +1 more source

Probing the (empirical) quantum structure embedded in the periodic table with an effective Bohr model

open access: yesQuímica Nova, 2013
The atomic shell structure can be observed by inspecting the experimental periodic properties of the Periodic Table. The (quantum) shell structure emerges from these properties and in this way quantum mechanics can be explicitly shown considering the ...
Wellington Nardin Favaro   +1 more
doaj   +3 more sources

Water and the Periodic Table

open access: yesSubstantia, 2019
Once upon a time, there was a Russian guy named Dmitri Mendeleev (1834-1907), who became Doctor of Science in 1865 at Saint Petersburg State University for his dissertation «On the Combinations of Water with Alcohol», a most important mixture in eastern ...
Marc Henry
doaj   +1 more source

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