How to Learn first 20 Elements of Periodic Table

Here is an easy mnemonic device to learn the first twenty elements of period table.This will be very useful in determining the valencies of these elements

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Download CLASS 10th CBSE Sample papers 2019

CBSE Sample Papers for Class 10 Science 2019 Solved Science Sample Question Paper 2019 Set 1 Solved Science Sample Question Paper 2019 ...