Destroying an object in a matrix

So basically, I have a grid 11x11 that is filled completely with an object of type prefab_1.

I have written the code to retrieve the exact coordinates of the position in the matrix (the grid) where I wan’t to destroy the object. How do I actually destroy the specific object, not all of them? What’s the smartest solution?

I’m writing in C#

Well if its a game object you can just call

Destroy(myMatrix[a,b]); 

That will destroy the game object, and leave a null reference at that position in your matrix.