WebAsela Chanaka is on Facebook. Join Facebook to connect with Asela Chanaka and others you may know. Facebook gives people the power to share and makes the world more … Web0714 820 596 Channa Asela Teacher, S. Thomas’ College, Mt. Lavinia P a g e 4 Periodic table 45. A periodic table to classify elements was first introduce in 1869 by a Russian scientist named Dmitri Mendellff. 46. The modern periodic table is based on the atomic number and the electronic configuration 47. The vertical columns are called groups and …
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