{"id":63089,"date":"2023-12-08T16:59:16","date_gmt":"2023-12-08T15:59:16","guid":{"rendered":"https:\/\/blog.salesflare.com\/entity\/lead"},"modified":"2023-12-08T16:59:16","modified_gmt":"2023-12-08T15:59:16","slug":"lead","status":"publish","type":"entity","link":"https:\/\/blog.salesflare.com\/fr\/entity\/prospect","title":{"rendered":"plomb"},"content":{"rendered":"<p class=\"translation-block\">Le plomb () est un \u00e9l\u00e9ment chimique du groupe du carbone, de symbole Pb (de ) et de num\u00e9ro atomique 82. Le plomb est un m\u00e9tal post-transition doux, mall\u00e9able et lourd. Le plomb m\u00e9tallique a une couleur blanc bleut\u00e9 lorsqu'il est fra\u00eechement coup\u00e9, mais il se ternit rapidement pour prendre une couleur gris\u00e2tre terne lorsqu'il est expos\u00e9 \u00e0 l'air. Le plomb pr\u00e9sente un \u00e9clat chrome-argent lorsqu'il est fondu en liquide. C'est \u00e9galement l'\u00e9l\u00e9ment non radioactif le plus lourd. Le plomb est utilis\u00e9 dans la construction de b\u00e2timents, les batteries plomb-acide, les balles et la grenaille, les poids, les soudures, les \u00e9tains, les alliages fusibles et comme bouclier contre les radiations. Le plomb a le num\u00e9ro atomique le plus \u00e9lev\u00e9 de tous les \u00e9l\u00e9ments stables, bien que l'\u00e9l\u00e9ment imm\u00e9diatement sup\u00e9rieur, le bismuth, ait un isotope dont la demi-vie est si longue (plus d'un milliard de fois l'\u00e2ge estim\u00e9 de l'univers) qu'il peut \u00eatre consid\u00e9r\u00e9 comme stable. Les quatre isotopes stables du plomb ont 82 protons, un nombre magique dans le mod\u00e8le de l'enveloppe nucl\u00e9aire des noyaux atomiques. L'isotope plomb-208 poss\u00e8de \u00e9galement 126 neutrons, un autre nombre magique, et est donc doublement magique, une propri\u00e9t\u00e9 qui lui conf\u00e8re une stabilit\u00e9 accrue : le plomb-208 est l'isotope stable connu le plus lourd. S'il est ing\u00e9r\u00e9, le plomb est un poison pour les animaux et les humains, car il endommage le syst\u00e8me nerveux et provoque des troubles c\u00e9r\u00e9braux. Un exc\u00e8s de plomb provoque \u00e9galement des troubles sanguins chez les mammif\u00e8res. Le plomb est une neurotoxine qui s'accumule dans les tissus mous et les os. Le saturnisme a \u00e9t\u00e9 document\u00e9 dans la Rome antique, la Gr\u00e8ce antique et la Chine antique.<\/p>","protected":false},"excerpt":{"rendered":"<p>Lead () is a chemical element in the carbon group with symbol Pb (from ) and atomic number 82. 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