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    https://fr.wikipedia.org/wiki/Or

    L'or est l'élément chimique de numéro atomique 79, de symbole Au. Ce symbole, choisi par Berzelius, est formé des deux premières lettres du mot latin aurum (de même sens). Le corps simple or est un métal noble, un métal précieux coloré précisément en jaune d'or, matière pure dense,

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    Étymologie
    Le nom de l'or, mot masculin , et le symbole Au viennent du latin aurum, de même signification, qui a donné l'adjectif aurifère qualifiant une matière ou un corps contenant de l'or. Dans les

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    L'or possède 37 isotopes connus, de nombre de masse entre 169 et 205, et 34 isomères nucléaires. Le seul isotope stable est

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    L'or est issu de la nucléosynthèse stellaire réalisée par des générations successives d'étoiles depuis une douzaine de milliards d'années. En particulier, deux hypothèses expliqueraient la formation d'or, par processus r, au sein des étoiles : le premier lors de l'explosion

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    L'or étant un métal noble, son nombre d'oxydation le plus commun est 0. Cependant, il peut former de nombreux composés, dans lesquels son nombre d'oxydation peut

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    L'or relativement stable est utilisé pour la dorure ou placage-recouvrement à la feuille traditionnelle, le fil d'or textile... Les techniques d'électrolyse

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    Toxicité
    L'or est utilisé comme bijou en contact avec la peau depuis plusieurs millénaires, sans problème de santé apparent.
    Il l'est aussi par la médecine en raison de sa faible propension à l'oxydation pour la fabrication de

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    L'or pur est un métal noble, malléable et très ductile, le plus ductile des métaux connus, et à la fois dense et tendre. Ce cristal à réseau cubique à faces centrées est un métal jaune plus ou moins brillant, qui acquiert un grand éclat après polissage. Il est relativement

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  2. https://en.wikipedia.org/wiki/Or

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    The 4th Army was a Royal Yugoslav Army formation mobilised prior to the German-led invasion of the Kingdom of Yugoslavia during World War II. It initially consisted of three infantry divisions, one brigade-strength detachment, one horse cavalry regiment and one independent infantry regiment.It was responsible for defending a large section of the Yugoslav–Hungarian border, …

  5. https://or.wikipedia.org/wiki/%E0%AC%AA%E0%AD%8D%E...

    ଅପ୍ରେଲ ଜନ୍ମ. ୧ – ବୈଜ୍ଞାନିକ ପ୍ରାଣକୃଷ୍ଣ ପରିଜା (ଜନ୍ମ: ୧୮୯୧); ୧ – ପଦ୍ମଶ୍ରୀ ତାରାପ୍ରସାଦ ଦାସ, ଚକ୍ଷୁ ବିଶେଷଜ୍ଞ (ଜନ୍ମ: ୧୯୫୦); ୨ – ଅଶ୍ରୁମୋଚନ ମହାନ୍ତି, ଓଡ଼ିଶା ରାଜ୍ୟ ...

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