Question

build a model of copper. place your materials on a sheet of paper. connect the marshmallows with straws using the picture as a guide. what was difficult about building the model?

Explanation:

Building a model of copper might face difficulties like accurately representing the atomic - level structure with marshmallows and straws, getting the correct proportions, and maintaining the stability of the model.

Answer:

Difficulties could include accurately representing the atomic structure, getting correct proportions, and model stability.