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Five elements A, B, C, D and E have atom...

Five elements `A, B, C, D` and `E` have atomic numbers of `2, 3, 7, 10` and `18` respectively. The elements which belong to the same period of the periodic table are :

A

A,B,C

B

B,C,D

C

A,D,E

D

B,D,E

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The correct Answer is:
B
NA
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LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. The electronic configuration of the atom of an element X is 2,8,4. In ...

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

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

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  4. The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 ...

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  5. Which of the following elements would lose an electron easily ?

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  6. Which of the following elements does not lose an electron easily ?

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  7. Where would you locate the element with electronic configuration 2,8 i...

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  8. An element which is an essential constituent of all organic compounds ...

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  9. Which of the following is the valence shell for the elements of second...

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  10. The element which has the maximum number of valence electrons is:

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  11. The correct increasing order of the atomic radii of the elements oxyge...

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  12. The atomic numbers of the elements Na, Mg, K and Ca are 11,12,19 and 2...

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  13. Which of the following are the correct characteristics of isotopes of ...

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  14. The correct formula of the oxide of Eka-aluminium element predicted by...

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  15. The element which can form an acidic oxide should be the one whose ato...

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  16. The element which forms a basic oxide has the atomic number of:

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  17. Which one of the following does not increase while moving down the gro...

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  18. On moving from left to right in a period in the periodic table, the si...

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  19. Which of the following set of elements is written in order of their in...

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  20. The atomic numbers of the three elements X,Y and Z are 2,6 and 10 resp...

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