Radon-222 is a radioactive gas which gives off alpha (α) particles. Its nuclide notation is $^{222}_{86}\text{Rn}$.
(a(i))[1]
State how many protons are present in one nucleus of radon-222.
(a(ii))[1]
Determine the number of neutrons in one nucleus of radon-222.
(b)[3]
Calculate the half-life for radon-222.
(c)[2]
Name two further sources that contribute significantly to background radiation.
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