Chemistry BCC problem

[tsundere tundra]

Length of unit cell, d, in cm (1cm = 10^7) nm
d = .429nm
.429nm(1cm/10^7nm) = 4.29x10^-7 cm

Volume of unit cell, V
V = (4.29x10^-7)^3 = 7.90x10^-26 cm^3

Number of atoms per unit cell - 2
Number of unit cells per mole Na - 6.02x10^23

Mass of a unit cell, m
Molar mass Na - 22.99 g/mol

22.99g/mol(1mol/6.02x10^23atoms)(2atoms/1unit cell) = 7.638x10^-23 g/unit cell

Density of sodium metal (Obs. .97 g/cm^3)

d=m/v
= 7.638x10^-23 / 7.90x10^-26 cm^3
= 967.4 g / cm^3

What did I do wrong? I'm not getting the observed value.