रसायनिक तत्त्व: Difference between revisions

 

'''रसायनिक तत्त्व''' धागु छगु कथंया [[अणु]] ख। थन्यागु अणुतेत इमिगु [[आणविक ल्याखं]] नं परिभाषित याइ। आणविक ल्याखं धागु अणुया न्युक्लियसय् दुगु प्रोटोनया ल्या ख। थ्व खंग्व छगु हे प्रोटोन ल्या दुगु शुद्ध रसायनिक वस्तुयात इंगीय यायेत नं छ्येलि। <ref>[[Compendium of Chemical Terminology]], [http://goldbook.iupac.org/C01022.html chemical element]</ref>

 

In 1661, [[Robert Boyle]] showed that there were more than just four [[classical element]]s as the ancients had assumed.<ref name="boyle" /> The first modern list of chemical elements was given in [[Antoine Lavoisier]]'s 1789 ''Elements of Chemistry'', which contained thirty-three elements, including [[light]] and caloric. By 1818, [[Jöns Jakob Berzelius]] had determined atomic weights for forty-five of the forty-nine accepted elements. In 1869, in [[Mendeleev]]'s famous [[periodic table]], shown below, there were sixty-six elements.

 

From Boyle until the early 20th century, an element was defined as a pure [[chemical substance|substance]] that cannot be decomposed into any simpler substance.<ref name="boyle">{{cite book | first=Robert | last=Boyle | authorlink=Robert Boyle | year=1661 | title=The Sceptical Chymist | location=London }}</ref> Said another way, an "element" cannot be transformed into other chemical substances by [[chemistry|chemical]] processes. In 1913, [[Henry Moseley]] discovered that the physical basis of the atomic number of the atom was its nuclear charge, which eventually led to the current definition. The current definition also avoids some ambiguities due to [[isotopes]] and [[allotropes]].

* [http://www.chemicalelements.com/ केमिकलइलेमेन्ट]

* [http://pearl1.lanl.gov/periodic/default.htm लस एलामोस देय् प्रयोगशाला]

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[[af:Chemiese element]]

[[et:Keemiline element]]

[[eu:Elementu kimiko]]

[[fi:Alkuaine]]

[[fiu-vro:Keemiline element]]