The radius of an atom is about

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(C) The radius of an atom is approximately $10^{-10} \ m$ $(1 \ \mathring{A})$,while the radius of its nucleus is approximately $10^{-15} \ m$ $(1 \ \

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$10,000$ times the radius of its nucleus

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(C) The radius of an atom is approximately $10^{-10} \ m$ $(1 \ \mathring{A})$,while the radius of its nucleus is approximately $10^{-15} \ m$ $(1 \ 	ext{fm})$.
Taking the ratio: $\frac{	ext{Radius of atom}}{	ext{Radius of nucleus}} = \frac{10^{-10} \ m}{10^{-15} \ m} = 10^5 = 100,000$.
In standard textbook approximations,the radius of an atom is often cited as being about $10,000$ to $100,000$ times the radius of the nucleus.
Given the options,$10,000$ is the most appropriate order of magnitude.

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