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Consider the following elements, ""(20...

Consider the following elements,
`""_(20)Ca, ""_(8)O, ""_(18)Ar, ""_(16)S, ""_(4)Be, ""_(2)He`
Which of the above elements would you expect to be:
(i) very stable? (ii) in group 2 of the periodic table?
(iii) in group 16 of the periodic table?

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The correct Answer is:
(i) `._(18)Ar` and `._(2)He` (Noble gases) (ii) `.(20)Ca` and `._(4)Be` (iii) `._(8)O` and `._(16)S`
NA
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LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. The atomic numbers of the three elements X,Y and Z are 2,6 and 10 resp...

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  2. An atom has the electronic structure of 2,7 (a) What is the atomic n...

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  3. Consider the following elements, ""(20)Ca, ""(8)O, ""(18)Ar, ""(16)S...

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  4. In the each of the following pairs, choose the atom having the bigger ...

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  5. The atomic numbers of three elements A,B and C are given below: Elem...

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  6. An element X belongs to 3rd period and group 2 of the periodic table. ...

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  7. The following diagram shows a part of the periodic table in which the ...

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  8. An element X is in group of the periodic table: (a) What will be the...

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  9. An element Y is in second period and group 16 of the periodic table: ...

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  10. (a) An element X has mass number 40 and contains 21 neutrons in its at...

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  11. An element X combines with oxygen to form an oxide XO. This oxide is e...

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  12. An element A has an atomic number of 6. Another element B has 17 elect...

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  13. The elements A,B,C and D belong to groups 1,2,14 and 17 respectively o...

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  14. An element X from group 2 reacts with element Y from group 16 of the p...

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  15. A metal X is in the first group of the periodic table. What will be th...

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  16. An element A from group 14 of the periodic table combines with an elem...

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  17. An element X from group 2 of the periodic table reacts with an elemen...

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  18. The following diagram shows a part of the periodic table containing f...

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  19. The elements A,B and C belong to groups 1,14 to 17 respectively of the...

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  20. Find the neutral atom in the periodic table which has the same number ...

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