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periodic table of elements
- Size: 5.85M
- Language: Simplified Chinese
- category: science tools
- System: 2000/XP
The periodic law of elements in modern chemistry was pioneered by Russian scientist Dmitri Mendeleev in 1869. He arranged the 63 elements known at that time in the form of a table according to their atomic weight, and placed elements with similar chemical properties in the same OK, this is the prototype of the periodic table of elements. Using the periodic table, Mendeleev successfully predicted the properties of elements that had not been discovered at the time (gallium, scandium, and germanium).
In 1913, the British scientist Moselle used cathode rays to hit metals to produce The arrangement of positive charges (i.e. number of protons or atomic number) took years of revision to become the contemporary periodic table.
In the periodic table, elements are arranged by their atomic number, with the smallest ones listed first. A horizontal row in the table is called a period, and a column is called a family.
Version: 2.01 | Update time: 2017-05-12
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Periodic Table Review
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1st floor Huajun netizen 2021-05-01 22:54:39The periodic table interface design is easy to use and has rich functions. I highly recommend it!
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2nd floor Huajun netizen 2009-04-18 02:47:10The periodic table of elements is not bad. It downloads very quickly. I give you a good review!
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3rd floor Huajun netizen 2007-06-10 06:47:20I hope the periodic table of elements can get better and better, come on!
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