# NEET Chemistry The Solid State Questions Solved

BOARD

Aluminium crystallizes in an fcc structure. Atomic radius of the metal is 125pm. What is the length of the side of the unit cell of the metal?

For fcc, Formula : r = $\frac{a}{2\sqrt{2}}$

Given: r= 125 pm

$\therefore$ a = $2\sqrt{2}$ r

a = $2\sqrt{2}$  $×$ 125

$⇒$a = 2$×$1.414$×$125 = 353.5 pm

Difficulty Level:

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