Question

Polonium (atomic mass $=209$) crystallizes in a simple cubic structure with a density of $9.32gc{m}^{-3}$. Its lattice parameter (in pm) is closest to:

• A. $421$
• B. $334$
• C. $481$
• D. $193$

Answer 1

The correct option is B $334$

$\rho =\frac{Z\times M}{V\times N_A}=\frac{1\times 209}{a^3\times 6.023\times {10}^{23}}=9.32$

$a=3.34\times {10}^{-10}cm$

$a=334pm$