Final answer:
The number of Rh atoms required to span a distance of 5.0 μm is 2.98 x 10⁷.
Step-by-step explanation:
To determine the number of Rh atoms needed to span a distance of 5.0 μm, we need to know the distance between Rh atoms. If we assume the distance between adjacent Rh atoms is equal to the radius of a Rh atom, we can calculate the number of atoms by dividing the distance by the radius. The radius of a Rh atom is approximately 168 pm (picometers) or 1.68 x 10⁻¹⁰ meters. Therefore, the number of Rh atoms required is:
5.0 μm / (1.68 x 10⁻¹⁰ m) = 2.98 x 10⁷ Rh atoms
So the correct answer is (d) 10.0 x 10⁶.