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Among the following, the number of eleme...

Among the following, the number of elements showing only one non-zero oxidation state is O,Cl,F,N,P,Sn,Tl,Na and Ti.

A

1

B

3

C

2

D

4

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The correct Answer is:
A
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Numerous forms of the periodic table have been devised from time to time. A modern version which is most convenient and widely used is the long or extended from of periodic table. The aufbau principle and the electronic configuration of atoms provide a theoretical foundation for the periodic classification. The horizontal rows are called periods. There are altogether seven periods. The first period consists of 2 elements. The subsequent periods consists of 8, 8,18, 18 and 32 elements respectively. The seventh period is incomplete and like the sixth period would have maximum of 32 elements. Elements having similar outer electronic configurations in their atoms are grouped in vertical columns. These are referred to as groups or families. According to the recommendations of IUPAC, the groups are numbered 1 to 18 replacing the older notation of groups 0, IA, IIA, ....VIIA, VIII, IB.....VIIB. Each successive period in the periodic table is associated with the filling up next higher principal energy level following aufbau sequence. The number of elements in each period is twice the number of atomic orbitals available in the energy level that is being filled. All the elements are classified into four blocks, i.e., s-block, p-block, d-block, and f-block depending on the type of atomic orbitals that are being filled with electrons. Elements A, B, C, D and E have the following electronic configuration: (A) 1s^2, 2s^2 2p^1 (B) 1s^2, 2s^2 2p^6 , 3s^2 3p^1 (C ) 1s^2, 2s^2 2p^6 , 3s^2 3p^3 (D) 1s^2 , 2s^2 2p^6 , 3s^2 3p^5 (E) 1s^2 , 2s^2 2p^6 , 3s^2 3p^6 Which among these will belong to same group in the periodic table ?

AAKASH SERIES-PERIODIC CLASSIFICATION-OBJECTIVE EXERCISE - 2 (PERIODIC CLASSIFICATION)
  1. Which of the following is an alloy of non-transition elements?

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  2. Common oxidation state of elemental transition metal is

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  3. Configuration that does not denote a transition element

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  4. An element of 5f-series but has no electrons filled in 5f-sub shell

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  5. An element has 18 electrons in the outer most shell. The element is

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  6. Element with electronic arrangement [Ar]3d^24s^2 belongs to

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  7. Number of outer shells partially filled for representative elements

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  8. Which of the following pairs has both members from the same group of t...

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  9. The elements with atomic number 10, 18, 36, 54 and 86 are all

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  10. Among the following, the number of elements showing only one non-zero ...

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  11. Following are some statements about modern periodic table i) It con...

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  12. The atomic number of the element which is not included in the main bod...

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  13. Match the Column {:("Column - I ","Column - II "),("a) Po ","i) Liqu...

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  14. Zinc is not considered as a transition metal because

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  15. The electronic configuration of an element 'X', is 1s^2 2s^2 2p^6 3s^2...

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  16. The IUPAC name of „Bh is

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  17. Number of unpaired electrons in Gd(Z =64) and the net electrons spin a...

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  18. Identify the correct statement

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  19. The following are some statements about transition elements i) IIB g...

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  20. An element with a mass number of 81 contains 31.7% more neutrons as co...

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