Astonishing table trick | important table trick | tables yaad karna sikhe | Table ko yaad karne ki magical trick

State the important salient features of the modern periodic table. State how separation of elements and periodicity of elements forms an important feature of the modern periodic table.

State the law on the basis of which Mendeleev classified the elements. Mention the important features of his periodic table. What are the merits and defects of Mendeleev's periodic table ?

Copy and complete the following table relating to important industrial processes.

What are the two important oxidation states of group 6 elements of the periodic table ?

Copy and complete the following table relating to important industrial process:

Copy and complete the following table relating to important industrial process. Output refers to the product of the process not the intermediate steps.

What is modern periodic law? Mention the important features of the long form of the periodic table. Why is this periodic table supposed to be superior to other periodic tables ?

(a) Water is an elixir of life, a very important natural resource. Your Science teacher wants you to prepare a plan for a formative assessment activity, "How to save water, the vital natural resource." Write any two ways that you will suggest to bring awareness in your neighbourhood, on 'how to save water'. (b) Name and explain any one way by which the underground water table does not go down further.

Silicon is the second most abundant element (~27.2%) in the earth's after oxygen (45.5 %) Carbon. Silicon, germanium, tin and lead constitute the group 14 of the periodic table. Chemistry of silicon is distinctly different from that of carbon. For example, under standard conditions CO_(2) is a gas whereas SiO_(2) is a covalent solid. Draw the structure of the anion present in pyroxene (MgCaSi_(2)O_(6)) . Silicones are important synthetic polymers which find extensive applications due to their chemical inertness and water repelling nature. Thet are produced via the following reactions. 2 C_(6)H_(5)Cl +Si underset("370 K")overset("Cu")to A A underset(-HCl)overset(H_(2)O)to B