To express the number 8 in complex form, we can write it as:
\[ 8 + 0i \]
In this representation, \(8\) is the real part and \(0i\) is the imaginary part (where the coefficient of \(i\) is \(0\)).
Thus, the complex form of the number 8 is:
\[ \boxed{8 + 0i} \]