https://padlet.com/3024911/ce0iyja5zg0c Made with magic en-us 2017-04-25 20:43:02 UTC 2025-11-09 20:34:25 UTC hello@padlet.com 3024911 https://padlet.com/3024911/ce0iyja5zg0c/wish/168499604 The most important uranium ore is uranite, usually called pitchblende.  ]]> 2017-04-26 20:43:53 UTC https://padlet.com/3024911/ce0iyja5zg0c/wish/168499604 3024911 https://padlet.com/3024911/ce0iyja5zg0c/wish/168501527 Plutonium was the second transuranium element of the actinide series to be discovered. By far of greatest importance is the isotope ²³⁹Pu, which has a half-life of more than 20000 years.]]> 2017-04-26 20:58:50 UTC https://padlet.com/3024911/ce0iyja5zg0c/wish/168501527 3024911 https://padlet.com/3024911/ce0iyja5zg0c/wish/168501854 Pure aluminium is a silvery-white metal with many desirable characteristics. It is light, nontoxic (as the metal), nonmagnetic and nonsparking. It is somewhat decorative.]]> 2017-04-26 21:01:26 UTC https://padlet.com/3024911/ce0iyja5zg0c/wish/168501854 3024911 https://padlet.com/3024911/ce0iyja5zg0c/wish/168502208 Hydrogen is the lightest element. It is by far the most abundant element in the universe and makes up about about 90% of the universe by weight.]]> 2017-04-26 21:04:51 UTC https://padlet.com/3024911/ce0iyja5zg0c/wish/168502208 3024911 https://padlet.com/3024911/ce0iyja5zg0c/wish/168502526 Pure metallic radium is brilliant white when freshly prepared, but blackens on exposure to air, probably due to formation of the nitride. It exhibits luminescence, as do its salts; it decomposes in water and is somewhat more volatile than barium.]]> 2017-04-26 21:07:40 UTC https://padlet.com/3024911/ce0iyja5zg0c/wish/168502526 3024911 https://padlet.com/3024911/ce0iyja5zg0c/wish/168502828 Europium ignites in air at about 150 to 180°C. Europium is about as hard as lead and is quite ductile. It is the most reactive of the rare earth metals, quickly oxidising in air]]> 2017-04-26 21:10:20 UTC https://padlet.com/3024911/ce0iyja5zg0c/wish/168502828