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Question

The approximate radius of a Hatom is 0.05 nm, and that of proton is 1.5×1015. Assuming both the hydrogen and the proton to be spherical, calculate fraction of the space in an atom of hydrogen that is occupied by the nucleus.

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Solution

Space occupied can be expressed in terms of volume of the proton.
Volume of the proton= 43Π(1.5×1015)3
Total volume of Hatom= 43Π(0.05×109)3
Space occupied= Volume of protonTotal volume of atom
=(1.5×10155×1011)3=(3×105)3
=2.7×10141 .

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