The density of krypton (face centered cubic cell) is \( 3.19 \mathrm{~g} / \mathrm{cm}^{3} \). W...

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The density of krypton (face centered cubic cell) is \( 3.19 \mathrm{~g} / \mathrm{cm}^{3} \). What is the radius of the atom? (Atomic mass : \( \mathrm{Kr}=84 \) )
(a) \( 0.198 \mathrm{~nm} \)
(b) \( 0.221 \mathrm{~nm} \)
(c) \( 0.206 \mathrm{~nm} \)
(d) \( 0.225 \mathrm{~nm} \)
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