The atomic radius of strontium is 215pm and it crystallizes with a cubical closest-packed structure.Calculate the density of strontium.The molar mass of strontium is $87.6gmol^{-1}$.

Question

$\begin{array}{1 1}2.586gcm^{-3}\\1.586gcm^{-3}\\3.586gcm^{-3}\\0.586gcm^{-3}\end{array}$