What is a radius of rhodium atom in angstroms (A)?

Question

Part A
What is the radius of a rhodium atom in angstroms? Express your answer using two significant figures.

Part B
What is the radius of a rhodium atom in meters? Express your answer using two significant figures.

Part C
How many Rh atoms would have to be placed side by side to span a distance of 3.5 mu m ?
Express your answer using two significant figures.

Part D
If the atom is assumed to be a sphere, what is the volume in m^3 of a single Rh atom?
Express your answer using two significant figures.

hcbiochem · Accepted Answer

A. According to this site (http://chemistry.about.com/od/elementfacts/a/rhodium.htm) the radius of a rhodium atom is 134 pm. 134 pm = 1.34 angstroms. With two significant figures, that would be 1.3 angstroms.

B. 1 angstrom = 1X10^-10 m. So, 1.3 A X (1X10^-10 m/1 A) = 1.3 X 10^-10 m

C. I'm not sure what unit you are meaning here. 

D. V = (4/3) Pi r^3
V = 4/3 (3.14) (1.3X10^-10)^3 = 9.2 X 10^-30 m

What is a radius of rhodium atom in angstroms (A)?

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