Chapter # 03 Atomic Structure
1994
Q.3 (a) What are the weaknesses
of Rutherford ’s atomic theory?
(b) How have these
defects been removed by Bohr’s atomic theory.
(c) Determine
an expression for the radius of hydrogen atom by applying Bohr’s atomic theory.
(d) Calculate the
radius of second orbit of hydrogen atom in agnstrom unit.
1995
Q.3 (a) Derive an expression of radius of nth orbit of hydrogen
atom.
(b) Discuss the
weakness of Rutherford atomic model.
(c) Give the
characteristic properties of alpha (a) rays.
(d) Calculate the
radius of orbit of 3rd for a hydrogen atom in angstrom unit.
Q.2 (c) Explain Pauli Exclusion principle.
1997
Q.2 (a) What information is
obtained from the cathode rays experiment about the structure of atom? Describe
the properties of cathode rays.
(b) Calculate the
wave number of spectral line of hydrogen when an electron jumps from n = 4 to n
= 2 (RH = 109678cm-1)
(c) State and
explain Hund’s Rule.
(d) Select the
correct answer for each.
I).
Which quantum number describes the shape of an orbital?
II).
Principle quantum number
III).
Azmuthal quantum number.
1998
Q.2 (a) Write the short note on
(i)
Electro negativity
(ii)
Pauli Exclusion principle
(b) Define Radio activity.
Describe the Characteristic of Alpha OR Gamma rays.
Q.4 (a) Write down the postulates of
Bohr’s Atomic theory and derive the expression of radius of hydrogen atom.
(b) Define spectrum and
discuss line spectrum.
(c) What rule and principles are violated in the following
electronic configuration.
(i)
1S2, 2S3
(ii)
1S2, 2P2
(iii)
1S2, 2S2, 2P6, 3S2,
3P6, 3d4
(d) Draw the shape of the orbital for which 1 = 0
(e) Make the
correct sequence of orbital for the electronic configuration. According to
(n+1) rule.
1999
Q.2 (a) What are cathode rays? How
are their properties proved?
(b) How was the
presence of proton detected and what are their
characteristic?
(c) Write a
short note on Radio activity or spectroscopy.
Q.4 (a) Define the following.
(ii)
Pauli Exclusion Principle
(iii)
Hund’s Rule
(iv)
Quantum number
2000
Q.2 (a) What are assumptions of Bohr’s Atomic theory? How does this
theory account for hydrogen spectrum?
(b) Start from
K.E = ½ mv2 P.E. = -Ze2
/r
Derive an expression for
energy of an electron in nth orbit of hydrogen
(c) (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
(d) Write the short
note:
·
Pauli Exculsion principle
·
X-rays and atomic number
2001
Q.3 (a) What are defects in Rutherford ’s atomic model?
(b) 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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(d) Draw the shape of the s and p- orbital
(e) Write the electronic configuration of the following:
(i)
Cr (Z = 24)
(ii) Cl1- (Z = 17)
(f) Write down the name of the spectral lines of a hydrogen atom.
2002
(Pre-Engineering)
Q.3 (a) (i) How were neutron discovered? Give the reaction.
(ii)
Compare the properties of Alpha, Beta and Gamma rays.
(b) Write shot note on any two of the following.
(i)
Heisenberg’s Uncertainty principle
(ii)
Ionization potential
(iii)
Line spectrum
(c) Describe Rutherford ’s nuclear model
of an atom with conclusions.
2002
(Pre-Medical)
Q.2 (a) Derive an expression for the
radius of Bhor’s orbit.
(b) What are
cathode rays? How are they produced? Discuss their
properties.
(c) Give the number of proton, neutron and electron for the following.
24 39
12Mg and
19K
(d) Write down the electronic configuration of:
Cr
(Z = 24) Li1+ (Z = 3) and F1- (Z = 9)
Q.8 (d) 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.
2003
(Pre-Engineering)
Q.5 (a) 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
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(b) 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)
(c) Write down the electronic
configuration of:
29Cu 19K1+ 8O2-
(d) Define cathode rays. Give at least
six properties of the cathode rays.
Q.8
(a) Differentiate the following:
·
Lyman and · Balmer series
2003
(Pre-Medical)
Q.3 (a) Describe Rutherford’s atomic model and explain its basic
assumptions and defects.
(b) Describe the experiment,
explaining the passage of electricity through Gases at low pressure.
(c) Explain any two of the
following:
(i)
Quantum Number
(ii)
X-rays and Atomic Number
(iii)
Electron Affinity
(e)
Write down the electronic configuration for the ground
state of the following:
Z = 19 , Z = 21 , Z = 6
2004
Q.2 (a) Give the number of proton,
neutron and electron for the following.
23 32 19 31
11Na 16S 9F 15P
(b) Derive and expression for the radius of Bhor’s orbit.
(c) What principle and rule
are followed in the electronic configuration of Atom?
(d) What are the
shape of the orbital for which 1 = 0, and 1 = 1?
(e) Differentiate
between natural and artificial radioactivity.
Q.4 (d) 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
____________.
2005
3-(a) Write the postulates of Bohr’s Atomic Theory. Derive an expression
for the energy of electron in an
atom.
(b) Differentiate between the following:
(i) Principal Quantum Number and Azimuthal
Quantum Number.
(ii) Continous Spectrum and Line Spectrum.
(c) (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
(d) State and explain the following:
(i) Pauli’s Exclusion Principle.
(ii) (n + 1) Rule.
(iii) Cathode Rays and their Properties.
2007
3-(a) Write four properties of Cathode Rays along with their experimental
proofs.
(b) (i) How
are positive rays generated in Cathod-Ray tube?
(ii) What is the relationship between X-Ray
& Atomic No.?
(c) Distinguish between α & β rays.
(d) Fill
in the blanks with the correct answers:
(i) The
n + 1 value of 3d orbital is 5.
(ii) The
electronic configration of. 7N 1s2 2s2 2px2
2py1. The rule violated in this is Hund’s
Rule.
(iii) The ionization energy of 4Be is greater than 3Li.
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