文章列表

• 1.万物简史 第149期:基本物质(21)
• The nineteenth century held one last great surprise for chemists. It began in 1896 when Henri Becquerel in Paris carelessly left a packet of uranium s...
• 2.万物简史 第148期:基本物质(20)
• For most of us, the periodic table is a thing of beauty in the abstract, but for chemists it established an immediate orderliness and clarity that can...
• 3.万物简史 第147期:基本物质(19)
• The structure of atoms and the significance of protons will come in a following chapter, so for the moment all that is necessary is to appreciate the ...
• 4.万物简史 第146期:基本物质(18)
• Mendeleyev used a slightly different approach, placing his elements into groups of seven, but employed fundamentally the same principle. Suddenly the ...
• 5.万物简史 第145期:基本物质(17)
• Mendeleyev dutifully completed his studies and eventually landed a position at the local university. There he was a competent but not terribly outstan...
• 6.万物简史 第144期:基本物质(16)
• Despite the occasional tidyings-up, chemistry by the second half of the nineteenth century was in something of a mess, which is why everybody was so p...
• 7.万物简史 第143期:基本物质(15)
• Because chemists for so long worked in isolation, conventions were slow to emerge. Until well into the second half of the century, the formula H2O2 mi...
• 8.万物简史 第142期:基本物质(14)
• No one knew about his principle, because Avogadro himself was a retiring fellow, he worked alone, corresponded very little with fellow scientists, pub...
• 9.万物简史 第141期:基本物质(13)
• Fortunately more sober types were at work elsewhere. In 1808, a dour Quaker named John Dalton became the first person to intimate the nature of an ato...
• 10.万物简史 第140期:基本物质(12)
• Soon after taking up his position, Davy began to bang out new elements one after anotherpotassium, sodium,magnesium, calcium, strontium, and aluminum ...