In the context of periodicity, a unit called picometre is used to measure the __________.

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1. Definition: $1\ \mathrm{pm} = 10^{-12}\ \mathrm{m}$.
2. Atomic radii and bond lengths are typically on the order of a few tens to a few hundreds of picometres, so the picometre is the appropriate unit for measuring atomic radius.
3. The other options are incorrect: molar mass is in units like g·mol^{-1}, atomic density uses units such as atoms per cm^{3} or kg·m^{-3}, and the spin quantum number is dimensionless.
FINAL_ANSWER: a

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