In this video I have explained Chapter 2 Periodic Classification of Elements for students of 10th standard from the Maharashtra State Board.

In this lecture we cover the concepts of Mendeleev’s Periodic table, Merits of Mendeleev’s periodic table and Demerits of Mendeleev’s periodic table in detail.

The following questions have also been answered in the video:

Think about it:
1. There are some vacant places in the Mendeleev’s periodic table. In some of these places the atomic masses are seen to be predicted. Enlist three of these predicted atomic masses along with their group and period.
2. Due to uncertainty in the names of some of the elements, a question mark is indicated before the symbol in the Mendeleev’s periodic table. What are such symbols?

Use your brain power?
Chlorine has two isotopes,viz, C135 and C1 37. Their atomic masses are 35 and 37 respectively. Their chemical properties are same. Where should these be placed in Mendeleev’s periodic table? In different places or in the same place?

Use your brain power on Page 20?
1. Write the molecular formulae of oxides of the following elements by referring to the Mendeleev’s periodic table. Na, Si, Ca, C, Rb, P, Ba, Cl, Sn.
2. Write the molecular formulae of the compounds of the following elements with hydrogen by referring to the Mendeleev’s periodic table. C, S, Br, As, F, O, N, Cl

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