jmc

Using the Triangle Inequality, we see that the third side of a triangle with sides $3\text{ cm}$ and $5\text{ cm}$ must be larger than $2\text{ cm}$ but smaller than $8\text{ cm}.$ If the third side must be a whole centimeter length, and the triangle is scalene, that means that the only possible lengths for the third side are: $4\text{ cm},$ $6\text{ cm},$ and $7\text{ cm}.$ That makes $\boxed{3}$ possible lengths for the third side.