QuestionHow many thorium atoms (240 pm radius) fit in a distance of $1.40 \mathrm{~mm}$?

Studdy Solution
Calculate the number of thorium atoms.
$$Number\, of\, thorium\, atoms =.40\, mm /4.8 \times10^{-4}\, mm =2916666.67$$Since we can't have a fraction of an atom, we round up to the nearest whole number. So, approximately2916667 thorium atoms would have to be lined up side by side to span a distance of.40 mm.