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| 1. |
Describe long form of periodic table? |
| Answer» The modern or\xa0long form\xa0of the\xa0periodic table\xa0is based on the modern\xa0periodic\xa0law. The\xa0table\xa0is the arrangement of elements in increasing order of their atomic numbers. The modern\xa0periodic table\xa0is the present\xa0form\xa0of the\xa0periodic table. And it consists of 18 vertical columns and 7 horizontal rows.Main features of long form of periodic table:\tGroups. The vertical columns in the periodic table are known as groups. ...\tPeriods. There are 7 periods in the long form of periodic table. ...\tLanthanoids. Group of 14 elements in the sixth period. ...\tActinides. Group of 14 elements in the seventh period after actinium. | |