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Elements whose atoms have their s and p-...

Elements whose atoms have their s and p-sub-levels complete are the:

A

Normal elements

B

Transition elements

C

Halogens

D

Inert gases.

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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 ?

The atomic number of an element is 35. what is the total number of electrons present in all the p-orbitals of the ground state atom of that element ?

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NCERT TELUGU-PERIODIC CLASSIFICATION-I-Questions (Choose the Best Answer)
  1. The elements having highest ionization energies within their periods a...

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  2. A property which progressively increases down a group in the periodic ...

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  3. Elements whose atoms have their s and p-sub-levels complete are the:

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  4. The law of triad is applicable to :

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  5. The law of octaves was stated by :

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  6. Which of the following property decreases down a group :

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  7. Which of the following has the lowest melting point ?

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  8. Which of the following hydroxide is most basic ?

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  9. Excluding hydrogen and helium, the smallest element in the periodic ta...

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  10. Which one among the following species has the largest atomic radius:

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  11. Which among the following is the lightest metal ?

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  12. Which of the following has highest ionization potential?

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  13. With respect to chlorine, hydrogen will be

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

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  15. Halogens belong to the :

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  16. Compared to first ionization enthalpy of an atom, the second is :

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  17. The correct arrangement of increasing atomic radius among Na, K, Mg, R...

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  18. The first attempt to classify the elements was made by :

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  19. Characteristic of transition elements is incomplete in :

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  20. Which of the following will have lowest first ionization enthalpy ?

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