a. An element cry

a. Given: d= 6.89 g/cm³

a= 3×10^-8cm

N_A=6.022×10²³ mol^-1

For bcc unit cell z=2

We know that

gm/mol

So the molar mass of the element is gm/mol

b.

i. p – type semiconductor is formed when Ge is doped with In

ii. n - type semiconductor is formed when Si is doped with P