Sub-atomic particles

[Khandro]

If an atom comprises mostly of space, then it follows that our bodies, constructed of atoms, are not solid and are mostly made up of space too. If the particles within the atoms were somehow combined, what would be their total volume ? I have read somewhere 'about the size of a pinhead'! Is this true? If not, what would the combined volume be ? and would it weigh as much as we do ?

[Khandro]

Thank you for all that, I shall now go and lie down in a darkened room !