Suppose each iron atom possesses a permanent magnetic moment of 2...

Maximum magnetization is achieved when all atomic magnetic moments are perfectly aligned parallel to each other.

The maximum magnetization $I$ is the total magnetic moment per unit volume, given by:

$I = n \times m$

where $n$ is the number of atoms per unit volume and $m$ is the magnetic moment of each atom.

Substituting the given values:

$I = (8.52 \times 10^{28}) \times (2 \times 9.27 \times 10^{-24})$

$I = 8.52 \times 18.54 \times 10^4$

$I = 157.96 \times 10^4$

$I \approx 1.58 \times 10^6 \text{ A m}^{-1}$