Question

An element (with atomic mass = 250 u) crystallises in a
simple cubic. If the density of the unit cell is 7.2 g cm
what is the radius of the element?
(a) 1.93 x 10 cm (b) 1.93 x 10 cm
(c) 193 x 10 m
(d) 1.93 x 10-* pm​

Answer 1

Answer:

z=

M

l

3

×ρ×N

A

1=

250

l

3

×7.2×6.023×10

23

l=3.86×10

−8

cm

l=2r (for simple cubic unit cell)

r=

2

l

=

2

3.86×10

−8

=1.93×10

−8

cm