1. Find the total mass of the compound:

* Total mass = mass of Be + mass of I

* Total mass = 8.6 g + 52.4 g = 61 g

2. Calculate the percentage of each element:

* Percentage of Be: (mass of Be / total mass) * 100%

* (8.6 g / 61 g) * 100% = 14.1%

* Percentage of I: (mass of I / total mass) * 100%

* (52.4 g / 61 g) * 100% = 85.9%

Therefore, the compound is approximately 14.1% beryllium (Be) and 85.9% iodine (I).