1a
2 marks
Iron and cobalt are adjacent elements in the Periodic Table. Iron has three main naturally occurring isotopes, cobalt has one.
Define the term isotope.
1b
3 marks
Isotopes of polonium, proton number 84, are produced by the radioactive decay of several elements including thorium, proton number 90. The isotope 213Po is produced from the thorium isotope 232Th.
Complete Table 1.1 to show the number of protons, neutrons and electrons in the two isotopes.
Table 1.1
Isotope | number of protons | number of neutrons | number of electrons |
|---|---|---|---|
213Po | |||
232Th |
1c
2 marks
Polonium has twenty-five different isotopes.
Explain why the isotopes of polonium exhibit the same chemical properties but their boiling points differ slightly.
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