S M BAQIR LECTURES
CHAPTER-2 STRUCTURE OF ATOM
Objective Part
Choose the right option. 10×1=10
A
B
C
D
1
Deuterium is used to make
Light water
Heavy water
Soft water
Hard water
2
Who discovered the proton
Goldstein
J. J. Thomson
Neil Bohr
Rutherford
3
Plum pudding model was put forwarded by:
Thomson
Chadwick
Goldstein
Dalton
4
Rutherford bombarded a thin sheet of gold with
α particles
β particles
Æ´ particles
X rays
5
Canal rays travel in a straight line in a direction_______ to cathode rays.
Opposite
Same
Parallel
None of these
6
The isotope C-12 is present in abundance of:
96.9%
97.6%
99.7%
None of these
7
Rutherford used a thin sheet of gold having thickness:
0.00004cm
0.004cm
0.0004cm
0.04cm
8
Which are the sub shells of M shell?
s, p
s, p, d
s, p, d, f
s, d, f
9
Quantum means:
Fixed volume
Fixed energy
Fixed pressure
Fixed temperature
10
The electrons revolve around the:
Atom
Nucleus
Proton
None of these
Subjective
Answer the short questions 10×2=20
1. What is atomic number of phosphorus? Write down its electronic configuration.
2. Write down the differences between Rutherford Atomic theory and Bohr’s Atomic theory.
3. What will be the nature of charge on an atom when it loses an electron or when it gains an electron?
4. Give three properties of positive rays.
5. What are the defects of Rutherford’s Atomic model?
6. What do you know about “Plum Pudding” theory?
7. Write down the electronic configuration of Cl- ion.
8. Give three characteristics of cathode rays.
9. Define electronic configuration.
10. What are shell and subshells?
Long Question 5×1=5
1. (a) Describe the postulates of Bohr’s Model of an atom. 3
(b) Describe the major applications of isotopes in our surroundings. 2