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Chemistry - 9 Chapter - 3
Atomic Structure
Test - 15
1.
Oxygen has ______ isotopes.
a) 3
b) 2
c) 1
d) 4
2.
Isotopes of oxygen are?
a)
16
8
O,
17
8
O,
19
8
O,
b)
16
8
O,
17
8
O,
18
8
O,
c)
15
8
O,
17
8
O,
18
8
O,
3.
The natural abundance of oxygen isotopes is 99.76 and 0.204 percent.
a) True
b) False
4.
The element chlorine is found in 2 isotope forms
35
17
C and
37
17
C
a) False
b) True
5.
Natural abundance of chlorine isotopes is 75.53% for 35^C and 24.47% for 37^C respectively. .( Consider that Figure 17 ( atomic Number ) is written on left bottom side of each "C" )
a) True
b) False
6.
Naturally occuring uranium contains ____________ isotopes.
a) 3
b) 1
c) 2
d) 4
7.
Natural abundance of uranium 234/92 is 0.006%, uranium 234/92 is 0.72%, and remaining is uranium 238/92.
a) False
b) True
8.
The number of neutrons in 238/92 will be:
a) 238-92 = 246
b) 238-92 = 146
c) 238+92 = 330
9.
In mono isotopic elements same type of atom are found.
a) False
b) True
10.
These are ____________ mono isotopic elements.
a) 25
b) 30
c) 20
d) 40
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