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description: nuclides having the same atomic number but different mass numbers

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Classification of the class isotope (Q25276)    
For help about classification, see Wikidata:Classification.
parent classes (classes of items which contain this one item) 
subclasses (classes which contain special kinds of items of this class)
<isotope> on wikidata tree visualisation (external tool)(depth=1)
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listing of subclasses, number of super and subclasses, properties of the instances: <isotope> on Miga
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via User_talk:Tamawashi, probably related to this item:

Du hast [1], [2] und [3] zurückgesetzt weil...? --Succu (talk) 22:04, 19 July 2014 (UTC)

Weil? --Succu (talk) 22:18, 19 July 2014 (UTC)

not a subclass of atom, definitely notEdit

An isotope is a class of atom, not a subclass of atom. An isotope is a type of atom. Which means the isotope class is a metaclass, see Help:Classification.

File:Atom classification.svg

TomT0m (talk) 14:55, 7 March 2015 (UTC)


chemical element (Q11344) --Fractaler (talk) 12:59, 16 November 2016 (UTC)

@Fractaler: Please see the following scheme :
author  TomT0m / talk page 13:08, 16 November 2016 (UTC)
Isotopes are variants of a particular chemical element --Fractaler (talk) 13:14, 16 November 2016 (UTC)
Page do not exists. author  TomT0m / talk page 13:19, 16 November 2016 (UTC)
@Fractaler: Variant is a figure of speach. It's a generic word with not really a tight meaning. On the other hand, subclass of has a precise meaning. How do you infer that "variant = subclass of" here ? It's not written "an isotope is an element" ... author  TomT0m / talk page 13:33, 16 November 2016 (UTC)
Ok, The term isotope is formed from the Greek roots isos (ἴσος "equal") and topos (τόπος "place"), meaning "the same place"; thus, the meaning behind the name is that different isotopes of a single element occupy the same position on the periodic table. --Fractaler (talk) 14:15, 16 November 2016 (UTC)
@Fractaler: (all of this assumes we adopt the definitions adopted by now enwiki A chemical element or element is a species of atoms having the same number of protons in their atomic nuclei (it's not have always been like this) or for frwiki Un élément chimique est l'ensemble des atomes caractérisés par un nombre défini de protons dans leur noyau. => a chemical element is the set of all atoms of a specific number of protons in their nuclei) A (specific) element - say Hydrogen - is a class of atom. An isotope - say Deuterium - is a class of atom as well. Then Deuterium is a subclass of Hydrogen - any Deuterium atom is an Hydrogen Atom. Does this imply that element is a subclass of element ? If it were so then Deuterium, as an isotope, would be both an isotope of an element ... rather we usually say that Deuterium is an hydrogen-isotope. More : assuming Deuterium was an element and Hydrogen was also an element, by definition this would imply that Deuterium would be the set of all atoms of atomic number "1" ... but Deuterium is only a subset of this as some Hydrogen atoms are not Deuterium atoms. So if Deuterium were an instance of "Element" this would lead to a contradiction. Hence Element is not a superclass of Isotope. Rather, as an isotope instance is a subclass of an element instance - here deuterium is a subclass of hydrogen - then it meets the definition of meta subcass of" and indeed there is a statement of this. author  TomT0m / talk page 17:38, 16 November 2016 (UTC)
Hydrogen is homonym (Q160843). Again disambig's problem: Hydrogen = Hydrogen (atom) + Hydrogen (isotope) + Hydrogen (element) + Hydrogen (gas). So, first - we need pages: 1) Hydrogen (atom) 2) Hydrogen (protium) 3) Hydrogen (deuterium) 4) Hydrogen (tritium) 5) Hydrogen (element) 6) Hydrogen (gas). --Fractaler (talk) 07:28, 17 November 2016 (UTC)
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