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Lecture 5: Valency or oxidation states ; Anamolous property of second group elements ; Periodic trend and chemical reactivity

  • Chapter 3 - Classification of Elements and Periodicity in Properties Assignments 1

    Why are elements at the extreme left and extreme right the most reactive?

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  • Chapter 3 - Classification of Elements and Periodicity in Properties Assignments 2

    What is the basis of triad formation of elements?

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  • Chapter 3 - Classification of Elements and Periodicity in Properties Assignments 3

    The size of isoelectronic species — F-, Ne and Na+ is affected by

    (a) Nuclear charge (Z )

    (b) Valence principal quantum number (n)

    (c) Electron-electron interaction in the outer orbitals

    (d) None of the factors because their size is the same.

     

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  • Chapter 3 - Classification of Elements and Periodicity in Properties Assignments 4

    Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?

    (a) Valence principal quantum number (n)

    (b) Nuclear charge (Z)

    (c) Nuclear mass

    (d) Number of core electrons.

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  • Chapter 3 - Classification of Elements and Periodicity in Properties Assignments 5

     

    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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  • Chapter 3 - Classification of Elements and Periodicity in Properties Assignments 6

    What do you understand by isoelectronic species? Name a species that will be

    isoelectronic with each of the following atoms or ions.

    (i) F-

    (ii) Ar

    (iii) Mg2+

    (iv) Rb+

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  • Chapter 3 - Classification of Elements and Periodicity in Properties Assignments 7

    How does atomic radius vary in a period and in a group? How do you explain the variation?

     

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  • Chapter 3 - Classification of Elements and Periodicity in Properties Assignments 8

    Why do elements in the same group have similar physical and chemical properties?

     

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  • Chapter 3 - Classification of Elements and Periodicity in Properties Assignments 9

    Which element do you think would have been named by

    (i) Lawrence Berkeley Laboratory

    (ii) Seaborg's group?

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    • Description:-

    Lecture 5:
    Today, we will discuss the last three topics of this chapter, i.e; Valency or oxidation states ; Anamolous property of second group elements ; Periodic trend and chemical reactivity Chapter 3 - Classification of Elements and Periodicity in Properties
    OBJECTIVES:
    1:  Learn about periodic table  Valency or oxidation states ; Anamolous property of second group elements ; Periodic trend and chemical reactivity
    Important Tip:
     This lecture about Classification of Elements and Periodicity in Properties is base for the further chapters. These topics help in many ways as to understand the and how we can use them. It help you in further studies also.
    Please go through the topic, their notes. Properly do the assignments, watch videos of the concerned topics. If you any doubt about any topic/point please submit it in the discussion section... it will be answered as soon as possible.
    After all of this... when you fell confident about the particular topic/chapter then take the quiz.

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