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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Which row correctly describes the number of outer shell electrons and properties of isotopes?
| Number of electrons | Chemical properties |
A | same | same |
B | same | different |
C | different | same |
D | different | different |
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1 markIridium 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% |
191.2
191.6
191.7
192.5
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