Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm³. What is the radius of a platinum atom? A) 69 pm B) 98 pm C) 139 pm D) 196 pm E) 277 pm

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Quizplus · Accepted Answer

The face-centered cubic (FCC) structure has 4 atoms per unit cell. Using the density formula and the volume of the unit cell, the atomic radius can be calculated. For platinum, this results in a radius of approximately 139 pm.

Platinum Has a Face-Centered Cubic Crystal Structure and a Density