2019 JAKSOLLISEN JÄRJESTELMÄN JUHLAVUOSI
Tässä LINKISSÄ on video jaksollisen järjestelmän kehittymisestä
"The United Nations have proclaimed 2019 to be the International Year of the Periodic Table of Chemical Elements to mark the 150th anniversary of the classification system that decorates chemistry classrooms and labs around the world. Since its inception in 1869, the periodic table has evolved significantly as the number of known elements has increased, along with our understanding of them."
"The United Nations have proclaimed 2019 to be the International Year of the Periodic Table of Chemical Elements to mark the 150th anniversary of the classification system that decorates chemistry classrooms and labs around the world. Since its inception in 1869, the periodic table has evolved significantly as the number of known elements has increased, along with our understanding of them."