need help with chem II

Okay somebody verify my answers

- Density: 10.5 g/cm ^3
- side length: 4.09 A ----> which is 4.09 x 10^8 centimeters
- Structure is Face centered: 4 atoms

Find mass

The forumula



Mass
_________________ = density

(side legnth in cm) ^ 3





Then it wants you to identify the the element,

I got 108.15 g/mol which is closet to Silver, 107.87




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2) - body center: 2 atoms
- radius: 222 pm
- Element is barium: 137.34 g/mol


Find density



I got 184 g/cm ^3 which seems very large compared to all the problems in my notes

someone verify that?