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Consider the followng elements: Ca, Cl...

Consider the followng elements:
`Ca, Cl, Na, I, Li, Ba Sr, K, Br`
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.

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The correct Answer is:
`LI, Na, K`: All these elements are metals having a valency of 1 `Ca, Sr , Ba`: All these elements are metals having a valencey of 2: `Cl, Br, I`: All these elements are halogens
NA
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LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. Consider the following elements: Na, Ca, Al, K,Mg, Li (a) Which of...

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  2. Which element has (a) two shells, both of which are completely filled...

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  3. Consider the followng elements: Ca, Cl, Na, I, Li, Ba Sr, K, Br Se...

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  4. Mendeleve predicted the exitence of certain elements not known at that...

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  5. A part of the early classification of elements has been given below: ...

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  6. (a) Explain why: (i) All the elements of a group have similar chemic...

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  7. (a) How does the electropositive character of elements change on going...

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  8. (a) What is the fundamental difference in the electronic configuration...

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  9. (a) What is the usual number of valence electrons and valency of group...

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  10. (a) What is the main characteristic of the last elements in the perio...

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  11. (a) How does the atomic size vary on going down form top to bottom in ...

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  12. (a) How does the tendency to lose electrons change as we go down in gr...

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  13. (a) Why does the side of the atoms progressively become smaller when w...

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  14. (a) In the modern Periodic Table, why does cobalt with higher atomic m...

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  15. (a) Explain why the first period of the modern periodic table has only...

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  16. (a) What is a group in the periodic table in which part of a group wou...

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  17. Which of the following statements is not a correct statement about the...

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  18. The electronic configuration of the atom of an element X is 2,8,4. In ...

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  19. The atomic number of an element is 20. In modern periodic table, this ...

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  20. Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and ...

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