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LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
- Consider the followng elements: Ca, Cl, Na, I, Li, Ba Sr, K, Br Se...
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- Mendeleve predicted the exitence of certain elements not known at that...
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- A part of the early classification of elements has been given below: ...
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- (a) Explain why: (i) All the elements of a group have similar chemic...
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- (a) How does the electropositive character of elements change on going...
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- (a) What is the fundamental difference in the electronic configuration...
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- (a) What is the usual number of valence electrons and valency of group...
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- (a) What is the main characteristic of the last elements in the perio...
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- (a) How does the atomic size vary on going down form top to bottom in ...
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- (a) How does the tendency to lose electrons change as we go down in gr...
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- (a) Why does the side of the atoms progressively become smaller when w...
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- (a) In the modern Periodic Table, why does cobalt with higher atomic m...
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- (a) Explain why the first period of the modern periodic table has only...
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- (a) What is a group in the periodic table in which part of a group wou...
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- Which of the following statements is not a correct statement about the...
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- The electronic configuration of the atom of an element X is 2,8,4. In ...
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- The atomic number of an element is 20. In modern periodic table, this ...
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- Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and ...
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- The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 ...
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- Which of the following elements would lose an electron easily ?
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