Exam code: 5070
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2.3 Isotopes
The atomic structure of atoms Q, R, S and T are shown in the table.
Atom | Number of protons | Number of neutrons | Number of electrons |
Q | 6 | 7 | 6 |
R | 7 | 7 | 7 |
S | 6 | 8 | 6 |
T | 8 | 8 | 8 |
Which two atoms are isotopes?
A | Q and S |
B | Q and T |
C | R and T |
D | R and S |
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Two isotopes of chlorine are 35Cl and 37Cl.
Using these isotopes, how many different relative molecular masses are possible for the compound with molecular formula C2H3Cl3?
2
3
4
5
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Two atoms, X and Y can be represented as shown
Which statement is correct for both atoms?
They have the same chemical properties because they have the same number of neutrons.
They have the same chemical properties because they have the same number of electrons in their outer shell.
They have the same physical properties because they have the same number of electrons in their outer shell.
They have the same physical properties because they have the same number of protons.
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Which row correctly describes the number of outer shell electrons and properties of isotopes?
Number of outer shell electrons | Chemical properties | |
A | same | same |
B | same | different |
C | different | same |
D | different | different |
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Iridium has two isotopes, 191Ir and 193Ir. Calculate the relative atomic mass of iridium using the data given:
Mass number | 191 | 193 |
Percentage abundance | 62.7% | 37.3% |
191.0
191.7
192.0
192.3
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Copper has two naturally occurring isotopes, 63Cu and 65Cu. The relative abundance of 63Cu is 69%.
What is the relative atomic mass of copper?
63.6
64.0
64.4
65.0
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