11C03 - Periodic Properties of Elements - Electron Gain Enthalpy & Metallic Character - Ashwin Sir

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Class 11 Chemistry – Periodic Table
We all have studied about different elements in our earlier classes. There are 114 elements presently known to men of which recently discovered are man – made. So why did we need a periodic table? Why was there a need to classify all the elements under different categories? What criteria was actually chosen to classify elements in the past? What changes and modifications led to the final periodic table which we see today? Can we predict the properties of one element from other element in the same block of periodic table? All these questions will we answered in this chapter. We’ll learn
1. How modern periodic table evolved?
2. What is the significance of groups and periods?
3. What are blocks in periodic table?
4. Atomic and ionic size trends.
5. What is Ionization enthalpy?
6. What is Electron Gain Enthalpy and metallic character?
7. What is electronegativity and valency?

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