(a(i))[1]
Describe in what way the nuclide notation shows that each isotope belongs to the same element.
(a(ii))[1]
Describe how the nuclide notation shows the differences between the isotopes.
(b)[2]
Radioactive sources give out radiation as they decay. State the names of three forms of radioactive emission.
(c)[4]
Complete the ionisation statement using words from the box. Each word may be used once, more than once, or not at all. When atoms are ionised, [BLANK] may be removed, leaving [BLANK] charged atoms (ions), or [BLANK] may be gained, forming [BLANK] charged atoms (ions).
(d)[2]
Calculate how many polonium-210 atoms are left in the sample after 280 days.