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## Main Question or Discussion Point

i have one problem on atomic radius. i read (http://en.wikipedia.org/wiki/Atomic_radius) the artical and try to understand it but i dont found any formula for it.

The problem is:

if the lattice parameter of alpha iron is 286 pm (Pico meter),what is its atomic radius?

here we have only one variable Lattice parameter = 286 is given.

please help me to solve the problem.

The problem is:

if the lattice parameter of alpha iron is 286 pm (Pico meter),what is its atomic radius?

here we have only one variable Lattice parameter = 286 is given.

please help me to solve the problem.