In 1895, Wilhelm Roentgen accidentally discovered that a cathode-ray tube could make a sheet of paper coated with barium platinocyanide glow, even when the tube and the paper were in separate rooms.
1895年,威廉·伦琴偶然发现阴极射线管能使涂有一层

酸盐钡的薄相纸发光,甚至当阴极射线管和相纸分别放在不同的房间时也能发光。
们发现沥青铀矿物中至少含有两种放射性物质:与铋伴生

钋,与


:Periodic Videos
已经到了, 这就是
为它比较软, 



