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Lecture 1: Sub-atomic Particles: Discovery of electrons ; Discovery of protons and neutrons ; Charge to mass ratio of electrons ; Miliken’s oil drop experiment

  • Chapter 2 - Structure of Atom Assignments 1

    What is a mass number?

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  • Chapter 2 - Structure of Atom Assignments 2

    What is an atomic number?

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  • Chapter 2 - Structure of Atom Assignments 3

    Name the scientist who first gave the atomic model.

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  • Chapter 2 - Structure of Atom Assignments 4

    Which experiment led to the discovery of electrons and how?

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  • Chapter 2 - Structure of Atom Assignments 5

    (i) What is the mass of a proton? 
    (ii) What is the charge of a proton?

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  • Chapter 2 - Structure of Atom Assignments 6

    What is the charge (e) of an electron?

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  • Chapter 2 - Structure of Atom Assignments 7

    What is the e/m ratio of an electron?

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  • Chapter 2 - Structure of Atom Assignments 8

    Name the scientist who first formulated the atomic structure.

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  • Chapter 2 - Structure of Atom Assignments 9

    Name the sub – atomic particles of an atom.

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  • Chapter 2 - Structure of Atom Assignments 10

    Similar to electron diffraction, neutron diffraction microscope is also used for the determination of the structure of molecules. If the wavelength used here is 800 pm, calculate the characteristic velocity associated with the neutron.

     

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  • Chapter 2 - Structure of Atom Assignments 11

    In Milikan's experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is -1.282 x 10-18C, calculate the number of electrons present on it.

     

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  • Chapter 2 - Structure of Atom Assignments 12

    Give the number of electrons in the species, H2 and O2.

     

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  • Chapter 2 - Structure of Atom Assignments 13

    What is the lowest value of n that allows g orbitals to exist?

     

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  • Chapter 2 - Structure of Atom Assignments 14

    (i) Write the electronic configurations of the following ions: (a) H- (b) Na+ (c) O2-(d) F-

    (ii) What are the atomic numbers of elements whose outermost electrons are represented by (a) 3s1 (b) 2p3 and (c) 3p5?

    (iii) Which atoms are indicated by the following configurations?

    (a) [He] 2s1 (b) [Ne] 3s2 3p3 (c) [Ar] 4s2 3d1.

     

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  • Chapter 2 - Structure of Atom Assignments 15

     

    Which of the following are isoelectronic species i.e., those having the same number of electrons?

    Na+, K+, Mg2+, Ca2+, S2-, Ar

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  • Chapter 2 - Structure of Atom Assignments 16

     

    How many neutrons and protons are there in the following nuclei?

    , , , , 

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  • Chapter 2 - Structure of Atom Assignments 17

      

    (i) Calculate the number of electrons which will together weigh one gram.

    (ii) Calculate the mass and charge of one mole of electrons.

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    • Description:-

    Lecture 1:
    Today, we will discuss the first four topics of this chapter, i.e; Sub-atomic Particles: Discovery of electrons ; Discovery of protons and neutrons ; Charge to mass ratio of electrons ; Miliken’s oil drop experiment from Chapter 2 - Structure of Atom
    OBJECTIVES:
    1:  Find out your doubts on these topics  Sub-atomic Particles: Discovery of electrons ; Discovery of protons and neutrons ; Charge to mass ratio of electrons ; Miliken’s oil drop experiment
    2: Try to solve the numerical problem on these topics i.e; Sub-atomic Particles: Discovery of electrons ; Discovery of protons and neutrons ; Charge to mass ratio of electrons ; Miliken’s oil drop experiment 
    Important Tip:
     This lecture about Structure of Atom 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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