An element X has a body centred cubic (bcc) structure with a cell edge of 200 pm. The density of the element is 5 gcm−3. The number of atoms present in 300 g of the element X is Given : Avogadro Constant, NA = 6.0 × 1023 mol−1 .
1
5 NA
2
6 NA
3
15 NA
4
25 NA