Elements and Compounds

How big is a silicon atom?

Answer

Wiki User
06/21/2009

Silicon has:

atomic mass 28.0855 g/mol [Wikipedia]

density 2.3290 g/cm^3 [Wikipedia]

==> 2.329000E6 g/m^3

==> 82.925E3 mol/m^3

mole 6.0221E23

==> 49.938E27 atoms per metre cubed

==> 20.025E-30 m^3 per atom

If the atom was a cube, each side would be 271E-12 metres.

If the atom was a sphere, its diameter would be 336.92E-12 metres.

If the atom was a tetrahedron, each side would be 553.87E-12 metres.