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ÀÛ¼ºÀÏ : 19-04-10 01:22
[Inter] Development of the periodic Table
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   Development of the periodic Table.docx (36.6K) [11] DATE : 2019-04-10 01:23:03
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7. When the elements known at the time were ordered by increasing atomic mass, it was found that successive elements belonged to different chemical groups and that the order of the groups in this sequence was fixed and repeated itself at regular intervals.
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18. Such anomalies are due to the relative abundance of the ¡°isotopes¡± or varieties of each element.
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19. All the isotopes of a given element have the same number of protons, but differ in their number of neutrons, and hence in their atomic mass.
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20. The isotopes of a given element have the same chemical properties but slightly  different physical properties.
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23. For example, a gap just below aluminum suggested
 a new element would be found with properties analogous to those of aluminum.
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11. Yet both chemists were sufficiently farsighted to leave gaps where their analyses of periodic physical and chemical properties indicated that new elements should be located.

--> ³ª´Â were sufficiently farsighted ¸¦ ÃæºÐÈ÷ Çö¸íÇß´Ù°í ÇØ¼®Çß¾ú´Âµ¥ ¾Õ¿¡ yetÀÌ ÀÖÀ¸´Ï±î Çö¸íÇÏÁö ¾Ê¾Ò´Ù ¶ó°í ÇØ¼®Çß¾î¾ß ¸Â¾ÒÀ» °Í °°´Ù


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