Addressing in hex file

Argh. We don't arrive to understand each other. Maybe is because my question has no sense when we know how it is done physically.

My idea of a memory (imagine it as a town) is, we have an address bus that permit to access a memory element (imagine it is as a building). The size of the address bus will simply indicate how many memory element we can access (bus of N bits => access to 2^N elements (2^N building in the town)).

You have a first type of memory where the size of an element is 8 bits (your building has 8 floors). So the data bus is 8-bit length.

Why can we not imagine a memory where the size of an element is 32 bits (your building has 32 floors), or 24 or even 15 if we want ?

I hope this metaphor will help to be understood.