Question

Question 2.36 2 × 108 atoms of carbon are arranged side by side. Calculate the radius of carbon atom if the length of this arrangement is 2.4 cm.

Class XI Structure of Atom Page 67

Answer 1

concept : calculate diameter with help of formula
$diameter =\frac{total\: length}{number\:of\:atoms}$

now, here,
total length = 2.4 cm = 0.024 m
number of atoms = 2 × 10^8 atoms

diameter = 0.024/2 × 10^8 = 1.2 × 10^-10 m

but we know,
diameter = 2 × radius
so, radius = 1.2/2 × 10^-10 m = 6 × 10^-11 m