exactinio

Français[modifier le wikicode]

Étymologie[modifier le wikicode]

(1904) Du latin ex-, « en sortant de, venant de », et actinio pour « actinium ».

Nom commun [modifier le wikicode]

Indénombrable
exactinio \ɛɡ.zak.ti.njo\

L’exactinio (radon) dans le tableau périodique des éléments.
Symboles désuets : Em, RaEm, ThEm, AcEm, Nt, Tn, An.

exactinio \ɛɡ.zak.ti.njo\ masculin

(Chimie) (Archaïsme) (Indénombrable) Radon-219 (l’élément chimique ²¹⁹Rn). Le terme ne semble pas être présent dans le corpus outre la traduction des communications de Ramsay.
- Si l’existence de l’actinium, comme élément déterminé était établie, la dénomination « exactinio » serait appropriée à son émanation. — (Le Moniteur scientifique du Doctor Quesneville, volumes 62–63, 1905)

Synonymes[modifier le wikicode]

émanation (Désuet)
niton (Désuet)
radon (nomenclature UICPA)

Traductions[modifier le wikicode]

Anglais : exactinio (en)

Anglais[modifier le wikicode]

Étymologie[modifier le wikicode]

(1904) Du latin ex-, « en sortant de, venant de », et actinio pour « actinium ».

It may be remembered that, at the Chemical Congress held in Paris in 1900, it was suggested that no element should receive a name until its spectrum had been mapped. […] The "emanation from radium," however, is a cumbrous expression, and sufficient evidence has now been accumulated that it is an element, accepting that word in the usual sense. It is true that it is only a transient element […] Now, it appears advisable to devise a name which should recall its source, and, at the same time, by its termination, express the radical difference which undoubtedly exists between it and other elements. As it is derived from radium, why not name it simply "exradio"? Should it be found that the emanation, which is supposed to be evolved from thorium, is really due to that element, and not to some other element mixed with thorium in exceedingly small amount, a similar name could be given, namely, "exthorio." If the existence of actinium as a definite amount is established, its emanation would appropriately be named "exactinio." It is unlikely that others will be discovered, but, if they are, the same principle of nomenclature might be applied. — (Sir William Ramsay, John Norman Collie, “The Spectrum of the Radium Emanation”, Proceedings of the Royal Society, volume 73, numéros 488–496, 1904, pages 470–476, doi 10.1098/rspl.1904.0064)