Is there a way for subclasses to inherit variable type and name but have their own values?

I would like to define variable type and name in the base class like this:

 class Element extends Monobehaviour {
     var z : int;
 }

Then I would like classes which inherit from the base class to retain the variable type and name but assign their own value:

 class Gold extends Element {
     z = 79;
 }

 class Silver extends Element {
     z = 47;
 }

However, this assignment should only affect the instance of the variable within that class, not the base class or other subclasses:

 // Element.js
 // no value declared but defaults to 0 if attached to gameobject
 Debug.Log("z");
 // 0
 
 // Gold.js
 Debug.Log("z");
 // 79
 
 // Silver.js
 Debug.Log("z");
 // 47

Is there a way to do this in Unity (either through inheritance or other functionality)? I anticipate creating a large number of subclasses and would prefer to have standardized variable names and type declarations for simplicity and convenience without resorting to copy-pasting if possible. Thanks.