Saturday, August 4, 2012

Assignments of Chapter # 03



Assignment #01

Class: XI                                                                                 Chapter: Atomic Structure
            Topic: Bohr’s Atomic Theory  

A-                 Radius of hydrogen atom:  
1-Determine the radius of the following orbit hydrogen atom:
i-First ii- Second  ii-Third iv-Fourth V-  Fifth
Compare your answer
2. Determine the distance between fifth and Fourth radius of hydrogen.
3. Determine the distance between fourth and Third radius of hydrogen.
4. Determine the distance between Third and second radius of hydrogen.
Arrange your answer in ascending order

B-                  Angular momentum of the electron of hydrogen :
1. Determine the angular momentum of the following  electrons :  
i- First orbit ii-Third orbit iii-Fifth orbit
C.         Energy of the electron:
1-Determine the energy  of  electron of the following orbit hydrogen atom:
i-First ii- Second  ii-Third iv-Fourth V-  Fifth
2. Determine the energy difference between fifth and Fourth radius of hydrogen.
3. Determine t he energy difference  between fourth and Third radius of hydrogen.
4. Determine t he energy  difference  between Third and second radius of hydrogen.
Arrange your answer in ascending order
D.        Frequency of radiation:
1-Determine the frequency of radiation absorb when electron jump from the first orbit to  the following orbit hydrogen atom:
i- Second  ii-Third iii-Fourth iv-  Fifth
2-Determine the frequency of radiation absorb when electron jump from the Second  orbit to  the following orbit hydrogen atom:
i-Third ii-Fourth  iii-  Fifth iv- sixth
E.         Wave number  of radiation:
1-Determine the wave number  of radiation absorb when electron jump from the first orbit to  the following orbit hydrogen atom:
i- Second  ii-Third iii-Fourth iv-  Fifth
2-Determine the wave of number  of radiation absorb when electron jump from the Second  orbit to  the following orbit hydrogen atom:
i-Third ii-Fourth  iii-  Fifth iv- sixth



Short Question Answer

Class :XI                    Chapter: Atomic Structure

1-What are the weaknesses of Rutherford’s atomic theory?
How have these defects been removed by Bohr’s atomic theory.
2-Determine an expression for the radius of hydrogen atom by applying Bohr’s atomic theory.
3-Calculate the radius of second orbit of hydrogen atom in Angstrom unit.

4-Derive an expression of radius of nth orbit of hydrogen atom.
5-Discuss the weakness of Rutherford atomic model.
6-Give the characteristic properties of alpha (a) rays.
7-Calculate the radius of orbit of 3rd for a hydrogen atom in angstrom unit.
8-Explain Pauli Exclusion principle.


9-What information is obtained from the cathode rays experiment about the structure of atom? Describe the properties of cathode rays.
10-Calculate the wave number of spectral line of hydrogen when an electron jumps from n = 4 to n = 2 (RH = 109678cm-1)
11-State and explain Hund’s Rule.
12-Select the correct answer for each.
                                        I).            Which quantum number describes the shape of an orbital?
                                     II).            Principle quantum number
                                  III).            Azmuthal quantum number.

13- Write the short note on
(i)                Electro negativity
(ii)             Pauli Exclusion principle
14-Define Radio activity. Describe the Characteristic of Alpha OR Gamma
rays.
15-Write down the postulates of Bohr’s Atomic theory and derive the expression of radius of hydrogen atom.
16- Define spectrum and discuss line spectrum.
17 -What rule and principles are violated in the following electronic
configuration.
(i)                1S2, 2S3
(ii)             1S2, 2P2
(iii)           1S2, 2S2, 2P6, 3S2, 3P6, 3d4
18) Draw the shape of the orbital for which 1 = 0
19-Make the correct sequence of orbital for the electronic configuration. According to (n+1) rule.
         

20- What are cathode rays? How are their properties proved?
21- How was the presence of proton detected and what are their     
      characteristic?
22-Write a short note on Radio activity or spectroscopy.
23- Define the following.
                   (ii) Pauli Exclusion Principle
                   (iii) Hund’s Rule
                   (iv) Quantum number
24- What are assumptions of Bohr’s Atomic theory? How does this theory account for hydrogen spectrum?
25- Start from
                   K.E = ½ mv2                           P.E. = -Ze2 /r
            Derive an expression for energy of an electron in nth orbit of hydrogen
26-(i) Bohr’s radius is 0.529 A0. Find the radius of 3rd orbit of Hydrogen atom.                                                 12
(ii) Complete                 4Be9 + 2He4 ®     6C + 6n1
(iii) Which rule and principle is violated in
          1S2, 2S2, Px ­¯, 2Py­, 2Pz
27Write the short note:
· Pauli Exculsion principle
· X-rays and atomic number

28- What are defects in Rutherford’s atomic model?
29- What happens when a current of high voltage is passes through gases at low pressure in the discharge tube? Prove that these rays.
(i)                Travel in straight line
(ii)             Are material in nature?
(iii)           Are electrons

9
 
30- Give the number of proton, neutron and electron for the following
3
 
26
 
                   19F1-         56Fe               7Li1+

31- Draw the shape of the s and p- orbital
32- Write the electronic configuration of the following:
                   (i) Cr (Z = 24)                            (ii) Cl1- (Z = 17)
33- Write down the name of the spectral lines of a hydrogen atom.


34-    (i) How were neutron discovered? Give the reaction.
                   (ii) Compare the properties of Alpha, Beta and Gamma rays.
35- Write shot note on any two of the following.
(i)                Heisenberg’s Uncertainty principle
(ii)             Ionization potential
(iii)           Line spectrum
36- Describe Rutherford’s nuclear model of an atom with conclusions.

)

37- Derive an expression for the radius of Bhor’s orbit.
38- What are cathode rays? How are they produced? Discuss their
     properties.
       39- Give the number of proton, neutron and electron for the following.
                   ­24                       39             
                     12Mg      and     19K
40- Write down the electronic configuration of:
                   Cr (Z = 24)    Li1+ (Z = 3)          and           F1- (Z = 9)
41- Write True of False.
(i)                Both the electrons in a helium atom have the same set of all the four quantum number.
(ii)             Alpha particle is helium nuclei.

)

42- Derive the expression for the energy of an electron in nth orbit of Hydrogen atom; given that:
                              n2 h2      ,       K.E. =  Ze2     ,         P.E = -Ze2
              4p 2m Ze2                       2r                             r
r
 
 
43-Calculate the following:
(i)                The angular momentum of the electron in the first energy level of hydrogen atom (Plank’s constant h= 6.625 * 10-27)
(ii)             The wave number of radiation emitted in Lyman series of hydrogen atom when electron jumps from 2nd to 1st orbit    (RH = 109678cm1-)
(iii)           The radius of the third orbit of hydrogen atom using Bohr’s radius     (ao = 0.529 Ao)
44- Write down the electronic configuration of:
                   29Cu           19K1+        8O2-
        45- Define cathode rays. Give at least six properties of the cathode rays.
46- Differentiate the following:
                   · Lyman                 and                 · Balmer series


47- Describe Rutherford’s atomic model and explain its basic assumptions and defects.
 48- Describe the experiment, explaining the passage of electricity through Gases at low pressure.
49- Explain any two of the following:
(i)                Quantum Number
(ii)             X-rays and Atomic Number
(iii)           Electron Affinity
50-Write down the electronic configuration for the ground state of the following:
Z = 19 ,           Z = 21 ,            Z = 6

51- Give the number of proton, neutron and electron for the following.
                   23                 32                 19                 31
                    11Na           16S                9F                15P
      52- Derive and expression for the radius of Bhor’s orbit.
       53- What principle and rule are followed in the electronic configuration of Atom?
54-What are the shape of the orbital for which 1 = 0, and 1 = 1?
55-Differentiate between natural and artificial radioactivity.
56- Fill in the blanks.
                   i) The electronic configuration of N(1S2, 2S2, Px­¯, 2Py­, 2PZ)
                      Show deviation form the ___________ rule.
                   ii) Isoelecetonic ions have different number of protons but the
same number of ____________.

57-    Write the postulates of Bohr’s Atomic Theory. Derive an expression for the energy of electron in                      an atom.
  58-  Differentiate between the following:
          (i)      Principal Quantum Number and Azimuthal Quantum Number.
          (ii)     Continous Spectrum and Line Spectrum.
  59-  (i)      Write the electronic configuration of:
                   (a) 13Al+3     (b) 29Cu                (c) 17Cl-1
          (ii)     Complete the equation:
                   4Be9 + 2He4 _________ + ________
          (iii)    Which rule of Principle is violated in writing the following electronic configuration:
 
                   1s, 2s, 2px, 2py, 2pz
  60-  State and explain the following:
          (i)      Pauli’s Exclusion Principle.
          (ii)     (n + 1) Rule.
          (iii)    Cathode Rays and their Properties. 

1 comment:

  1. Well Done SIr It help Me Alot Preparing My Exams ...
    Keep It UP

    ReplyDelete