Assignment
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
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
|
|
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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.
(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
4p 2m Ze2 2r 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.
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