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    on the basis of quantum numbers justify that the sixth period of the periodic table should have 32 elements

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    On the basis of quantum numbers, justify that the sixth period of the periodic table should have 32 elements.

    On the basis of quantum numbers, justify that the sixth period of the periodic table should have 32 elements.

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    On the basis of quantum numbers, justify that the sixth period of the periodic table should have 32 elements.

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    On the basis of quantum numbers, justify that the sixth period of the periodic table should have 32 elements.

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    NCERT - Grade 11 - Chemistry - Classification of Elements and Periodicity - Q14

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    In the periodic table of the elements, a period indicates the value of the principal quantum number (n) for the outermost shells. Each period begins with the filling of principal quantum number (n). The value of n for the sixth period is 6. For n = 6, azimuthal quantum number (l) can have values of 0, 1, 2, 3, 4.

    According to Aufbau’s principle, electrons are added to different orbitals in order of their increasing energies. The energy of the 6d subshell is even higher than that of the 7s subshell.

    In the 6th period, electrons can be filled in only 6s, 4f, 5d, and 6 p subshells. Now, 6s has one orbital, 4f has seven orbitals, 5d has five orbitals, and 6p has three orbitals. Therefore, there are a total of sixteen (1 + 7 + 5 + 3 = 16) orbitals available. According to Pauli’s exclusion principle, each orbital can accommodate a maximum of 2 electrons.

    Thus, 16 orbitals can accommodate a maximum of 32 electrons. Hence, the sixth period of the periodic table should have 32 elements.

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    SAME EXERCISE QUESTIONS

    Q.

    Which of the following pairs of elements would have a more negative electron gain enthalpy?

    (i) O or F (ii) F or Cl

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    Which of the following statements related to the modern periodic table is incorrect?

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    (c) Each block contains a number of columns equal to the number of electrons that can occupy that subshell.

    (d) The block indicates value of azimuthal quantum number (l ) for the last subshell that received electrons in building up the electronic configuration.

    Q.

    Which one of the following statements is incorrect in relation to ionization enthalpy?

    (a) Ionization enthalpy increases for each successive electron.

    (b) The greatest increase in ionization enthalpy is experienced on removal of electron from core noble gas configuration.

    (c) End of valence electrons is marked by a big jump in ionization enthalpy.

    (d) Removal of electron from orbitals bearing lower n value is easier than from orbital having higher n value.

    Q.

    Considering the elements B, Al, Mg, and K, the correct order of their metallic character is:

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    On the Basis of Quantum Numbers, Justify that the Sixth Period of the Periodic Table Should Have 32 Elements.

    On the Basis of Quantum Numbers, Justify that the Sixth Period of the Periodic Table Should Have 32 Elements.

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    On the basis of quantum numbers, justify that the sixth period of the periodic table should have 32 elements.

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    SOLUTION 1

    In the periodic table of the elements, a period indicates the value of the principal quantum number (n) for the outermost shells. Each period begins with the filling of the principal quantum number (n). The value of n for the sixth period is 6. For n = 6, azimuthal quantum number (l) can have values of 0, 1, 2, 3, 4.

    According to Aufbau’s principle, electrons are added to different orbitals in order of their increasing energies. The energy of the 6d subshell is even higher than that of the 7s subshell.

    In the 6th period, electrons can be filled in only 6s, 4f, 5d, and 6 p subshells. Now, 6s has one orbital, 4fhas seven orbitals, 5d has five orbitals, and 6p has three orbitals. Therefore, there are a total of sixteen (1 + 7 + 5 + 3 = 16) orbitals available. According to Pauli’s exclusion principle, each orbital can accommodate a maximum of 2 electrons. Thus, 16 orbitals can accommodate a maximum of 32 electrons.

    Hence, the sixth period of the periodic table should have 32 elements.

    SOLUTION 2

    The sixth period corresponds to sixth shell. The orbitals present in this shell are 6s, 4f, 5p, and 6d. The maximum number of electrons which can be present in these sub¬shell is 2 + 14 + 6 + 10 = 32. Since the number of elements in a period corresponds to the number of electrons in the shells, therefore, sixth period should have a maximum of 32 elements.

    Concept: Modern Periodic Law and the Present Form of the Periodic Table

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    Chapter 3: Classification of Elements and Periodicity in Properties - EXERCISES [Page 96]

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    Chapter 3 Classification of Elements and Periodicity in Properties

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