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Chemistry 9 Chapter 2 Structure of Atom -8
1.
Which one of the following is rare?
a) all of these
b) U-238
c) U-235
d) U-234
2.
How many neutrons are present in U-234?
a) 146
b) 142
c) 143
d) 234
3.
How many neutrons are present in U-235?
a) 235
b) 143
c) 92
d) 142
4.
How many protons are present in U-238?
a) 146
b) 92
c) 238
d) 143
5.
When uranium-238 decays into thorium-234, it emits?
a) alpha particle
b) beta particle
c) none of these
d) gamma particle
6.
How many electrons are present in U-235?
a) 235
b) 143
c) 146
d) 92
7.
The fission of uranium-235 yields?
a) smaller nuclie
b) energy
c) neutron
d) all of these
8.
Isotopes of an element have similar chemical properties because the chemical properties of an element depends upon the number of?
a) protons and electrons
b) protons only
c) neutrons
d) electrons only
9.
Which one of the following isotope is used to diagnose thyroid proplems?
a) Na-24
b) Iodine-123
c) Radioactive iodine-131
d) Cobalt-60
10.
Which one of the following is used to trace the flow of blood?
a) I-123
b) C-12
c) Na-24
d) C-14
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