Le “Tableau périodique des éléments chimiques” est vieux de 155 ans,jour pour jour !

HAKIZIMANA Maurice

Il ya exactement 155 ans, jour pour jour,c’était le 6 mars 1869 le russe Dimitri Ivanovitch Mendeleïev présentait son classement périodique des éléments chimiques.

Le grand chimiste Dimitri Ivanovitch Mendeleïev

Ce jour-là, devant la Société chimique russe, le chimiste russe Dimitri Ivanovitch Mendeleïev présente sa classification périodique des éléments. Il s’agissait en fait d’un classement des 63 éléments chimiques connus par lequel il démontrait que les propriétés chimiques de chaque élément se répétaient à intervalles réguliers.

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La classification qu’il venait de faire fut alors baptisée “Tableau périodique de Mendeleïev”. Dans son tableau, tous les éléments d’une même colonne affichaient des propriétés comparables.

Cette invention révolutionna le monde de la chimie et de nouveaux éléments découverts trouvèrent naturellement leur place dans le tableau de Mendeleïev. Depuis lors, le Tableau périodique a connu de nombreux réajustements jusqu’à prendre la forme que nous lui connaissons aujourd’hui.

Il est devenu un référentiel universel auquel peuvent être rapportés tous les types de comportements physique et chimique des éléments. Depuis novembre 2014, sa forme standard comporte 118 éléments allant de 1H à 118Uuo. Bonne 155 ème anniversaire du tableau periodique des éléments aux amoureux de la chimie.

Mwalimu HAKIZIMANA MAURICE 

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526 thoughts on “Le “Tableau périodique des éléments chimiques” est vieux de 155 ans,jour pour jour !

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