Answer:
Body-centered cubic
Explanation:
As the edge length of the cubic unit is 350pm, its volume is:
(350x10⁻¹²m)³ = 4.288x10⁻²⁹m³. In cm³
4.288x10⁻²⁹m³ ₓ ([100cm]³ / 1m³) = 4.288x10⁻²³cm³.
As the density of the structure is 0.535g/cm³, the mass of a cubic unir is:
4.288x10⁻²³cm³ ₓ (0.535g / cm³) = 2.29x10⁻²³g,
As atomic mass of Lithium is 6.941g/mol. Mass of 1 atom of Li is:
6.941g/mol ₓ 1mol / 6.022x10²³ atoms = 1.1526x10⁻²³ g / atoms.
Thus, atoms of Li in 2.29x10⁻²³g are:
2.29x10⁻²³g ₓ ( 1 atom / 1.1526x10⁻²³g) = 2 atoms in 1 cubic unit
In body-centered cubic unit cell, there are 2 atoms per cubic unit cell. Thus, structure of Li is:
Body-centered cubic
