Units cells and number of atoms

An element A (Atomic weight =100 ) having b.c.c. structures has unit cell edge length 400 pm. Calculate the density of A. number of unit cells and number of atoms in 10 g of A.

An element having bcc structure has 12.8xx10^(23) unit cells. The number of atoms in these cells is

In a body centred unit cell, the number of atoms present is

Perovaskite, a mineral containing calcium, oxygen & titanium crystallizes in the given unit cell Total number of atom present in a unit cell is

HCP unit cell number of atoms

In a HCP unit-cell, if total number of atoms per unit cell gets halved, then what is the percentage void in unit cell ?

An elementoccurring in the bcc structure has 12.08 xx 10^(23) unit cells .The total number of atoms of the element in these cells will be