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| 1. |
What os mean by periodic classifisatioj |
| Answer» In 1913, Henry Moseley proved that the atomic number is the fundamental property rather than its atomic mass.Modern Periodic Law: Properties of elements are a periodic function of their atomic numbers.The periodic table, based on the Modern Periodic Law is called the Modern Periodic Table.The horizontal rows in the Modern Periodic Table are called periods.The Modern Periodic Table consists of seven periods which are numbered from 1 to 7.In each period, a new shell starts filling up. The period number is also the number of shell which starts filling up.The vertical columns are called groups and consist of eighteen groups numbered from 1 to 18.Elements having the same number of valence electrons are present in the same group. | |