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Há 18 horas · Silicon is a chemical element; it has symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic luster, and is a tetravalent metalloid and semiconductor. It is a member of group 14 in the periodic table: carbon is above it; and germanium, tin, lead, and flerovium are below it. It is relatively unreactive.
Há 18 horas · French nobleman and chemist Antoine Lavoisier (1743–1794), with a page of the English translation of his 1789 Traité élémentaire de chimie, listing the elemental gases oxygen, hydrogen and nitrogen (and erroneously including light and caloric); the nonmetallic substances sulfur, phosphorus, and carbon; and the chloride, fluoride and borate ions
Há 18 horas · 9. Who developed the theory of uniformitarianism? A) James Hutton B) Charles Lyell C) Charles Darwin D) Antoine Lavoisier
Há 18 horas · 6. Who discovered the first dinosaur fossil? A) William Buckland B) Gideon Mantell C) Richard Owen D) Charles Darwin
Há 18 horas · Millau. Au « Pic Vert », rouvrir pour vivre. Le SOM Taekwondo avait réuni 13 participantes pour le dernier stage de self-défense féminine, ce samedi 1er juin. Marc Boudes, professeur historique du club a toujours à cœur de partager ses connaissances en self-défense et de donner quelques astuces pour savoir comment agir en cas d’agression.
Há 18 horas · மரபியலின் தந்தை கிரிகோர் மெண்டல் கதை | Story of Father of Genetics Gregor Mendel in Tamil @TAMILFIRECHANNEL மனுகுலம் உண்மையாக வளர்ச்சி அடையத் தொடங்கியது எப்போது?
- 9 min
- TamilFire
