求购二手半挂车:跪求：门捷列夫英文资料

A New Vision of the Periodic Table of the Elements

The matter in the world about us is almost entirely made from 83 elements, which differ from each other by the positive electric charge on their central nucleus and hence the number of electrons they are able to attract. Another 10 elements exist in trace quantities as unstable products of the radioactive breakdown of the two heaviest elements, and another 20 elements have been made in the laboratory.

Chemists discovered in the 1860s that if the elements are arranged in the order of the mass of their atoms (or as later realized, the charge on their nucleus), chemical characteristics recur regularly. Dmitri Mendeleyev in 1869 published his Periodic Table, in which he arranged the elements then known in rows and columns to show this regularity, forecasting the discovery of missing elements. This was a convenient way to present the information, but he recognized that it did not fully represent the overall pattern because it broke up the sequence. He thought the ideal would be a cylindrical helix, but that needs three dimensions.

Many chemists before and after Mendeleyev have proposed a spiral image, to get the advantages of a helix in two dimensions. My Chemical Galaxy is the latest of these versions, using a starry pathway to link the elements and to express the astronomical reach of chemistry. The intention is not to replace the familiar table, but to complement it and at the same time to stimulate the imagination and to evoke wonder at the order underlying the universe.

Introduction
Periodic Table first discovered in 1869 by Dmitry I. Mendeleyev is a way of presenting all the elements so as to show their similarities and differences. The elements are arranged in increasing order of atomic number(Z) as you go from left to right accross the table. The horizontal rows a called periods and the vertical rows, groups.
A noble gas is found at the right hand side of each period. There is a progression from metals to non-metals across each period. Elements found in groups (e.g. alkali, halogens) have a similar electronic configuration. The number of electrons in outer shell is the same as the number of the group.

A New Vision of the Periodic Table of the Elements

The matter in the world about us is almost entirely made from 83 elements, which differ from each other by the positive electric charge on their central nucleus and hence the number of electrons they are able to attract. Another 10 elements exist in trace quantities as unstable products of the radioactive breakdown of the two heaviest elements, and another 20 elements have been made in the laboratory.

Chemists discovered in the 1860s that if the elements are arranged in the order of the mass of their atoms (or as later realized, the charge on their nucleus), chemical characteristics recur regularly. Dmitri Mendeleyev in 1869 published his Periodic Table, in which he arranged the elements then known in rows and columns to show this regularity, forecasting the discovery of missing elements. This was a convenient way to present the information, but he recognized that it did not fully represent the overall pattern because it broke up the sequence. He thought the ideal would be a cylindrical helix, but that needs three dimensions.

Many chemists before and after Mendeleyev have proposed a spiral image, to get the advantages of a helix in two dimensions. My Chemical Galaxy is the latest of these versions, using a starry pathway to link the elements and to express the astronomical reach of chemistry. The intention is not to replace the familiar table, but to complement it and at the same time to stimulate the imagination and to evoke wonder at the order underlying the universe
Introduction
Periodic Table first discovered in 1869 by Dmitry I. Mendeleyev is a way of presenting all the elements so as to show their similarities and differences. The elements are arranged in increasing order of atomic number(Z) as you go from left to right accross the table. The horizontal rows a called periods and the vertical rows, groups.
A noble gas is found at the right hand side of each period. There is a progression from metals to non-metals across each period. Elements found in groups (e.g. alkali, halogens) have a similar electronic configuration. The number of electrons in outer shell is the same as the number of the group.

Mendeleev, Dmitri Ivanovich, 1834–1907, Russian chemist. He is famous for his formulation (1869) of the periodic law and the invention of the periodic table, a classification of the elements; with Lothar Meyer, who had independently reached similar conclusions, he was awarded the Davy medal in 1882. From his remarkable table Mendeleev predicted the properties of elements then unknown; three of these (gallium, scandium, and germanium) were later discovered. He studied also the nature of solutions and the expansion of liquids. An outstanding teacher, he was professor at the Univ. of St. Petersburg (1868–90). He directed the bureau of weights and measures from 1893 and served as government adviser on the development of the petroleum industry. His Principles of Chemistry (2 vol., 1868–71; tr. 1905) was long a standard text. Various transliterations of his surname are common, among them Mendeleyev and Mendelejeff.