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Two elements A and B have the following ...

Two elements A and B have the following electronic configurations. The formula of the compound formed between them can be `A=1s^2 2s^2 2p^6 3s^2 3p^1 , B=1s^2 2s^2 2p^4`

A

AB

B

`AB_2`

C

`A_2B_3`

D

`A_3B_2`

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The correct Answer is:
C
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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 ?

Which of the following electronic configurations has the lowest ionization enthalpy ? (a) 1s^2 , 2s^2 , 2p^6 , ,(b) 1s^2 , 2s^2 , 2p^6 (c) 1s^2 , 2s^2 , 2p^6 , 3s^2 .

To which element does the following electronic configuration correspond ? 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)

To which element does the following electronic configuration correspond ? 1s^(2)2s^(2)2p^(6)3s^(2)3p^(1)

AAKASH SERIES-PERIODIC PROPERTIES-LEVEL-I (MAIN) EXERCISE-III
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  3. Which of the following is true regarding inert pair effect ?

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  4. Generally the ionisation potential in a period increases, but there ar...

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  5. Element that has the highest first ionisation energy among the followi...

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  6. The ionization potential of nitrogen is more than that of oxygen becau...

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  7. Which of the following element has the greatest tendency to lose elect...

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  8. Second ionisation potential of oxygen is

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  9. In which of the following process maximum energy is released

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  10. Ionisation energy of F^- is equal in magnitude with the electron affin...

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  11. When an electron is added, energy is absorbed in which of the followin...

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  12. The correct order of electron affinity of the elements of oxygen famil...

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  13. The I.P of X ion is equal to

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  14. Energy is released in the process of

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  15. Which of the following is the correct order of electron affinity

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  16. Pair of elements with equal values of electronegativiy

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  17. The electronegativity of the following elements increase in the order

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  18. Two elements A and B have the following electronic configurations. The...

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  19. The formula of a metallic carbonate is MCO3. The formula of that metal...

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