how many elements are there in the periodic table? how many are important and must be learned??????????????????
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You can learn Atomic Number (Z) & Mass Number (A) till Calcium. Learn Hydrogen/Alkali Metals , Alkaline Earth Metals, Boron, Carbon, Nitrogen, Oxygen, Flourine & Halogen Groups. All the reasoning questions that will be asked in examinations will be based on two concepts which you have to understand very carefully are,
Atomic Radius (Effects of increase/decrease in atomic radius)
Effective Atomic Charge (Effects of losing/gaining an electron when no. protons remains same, how it will effect the total electrostatic force b/w electrons & electrons and electrons & protons)
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