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Mendlev periodic table |
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Answer» 8 colonm and 6 rows mandeleev periodic table are base on atomic mass but they arrange all metals acc.to their chemical properties and left some space for those element who could not discover at this time.. \tFeatures of Mendeleev’s Periodic Table:\tThere are seven horizontal rows in the periodic table, numbered from 1 to 7. These seven rows are called periods.\tThere are eight vertical columns numbered from I to VIII. These eight columns are called groups. Groups I to VII are further divided into sub groups A and B.\tThe properties of elements in a particular period show regular gradation from left to right.\tAchievements of Mendeleev’s Periodic Table:\tMendeleev kept some blank spaces in the periodic table for the elements which were yet to be discovered.\tHe also predicted properties of some elements even before their discovery which were later found to be correct.\tMendeleev’s periodic table could accommodate noble gases when they were discovered. |
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