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Question:
How to remember Atomic number and atomic masses of random elements I always get confused if somebody asks what is the atomic number of,for say, Thorium or Niobium or like which element has its atomic no 25 Also how to remember electronic configurations of different elements because such questions are asked in neet
Answer:

You dont need to learn all the atmoic number 

Even if you are preparing for JEE Advance / NEET they will give you the number in question also

Thanks 

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