An element \( M \) crystallises in a body centred cubic unit cell with a cell edge of \( 300 \, \text{pm} \). The density of the element is \( 6.0 \, \text{g} \, \text{cm}^{-3} \). The number of atoms present in \( 180 \, \text{g} \) of the element is ________ \( \times 10^{23} \). (Nearest integer)
