what all things we need to make a bohr model of an atom?

Question

it's my project of biology class.we have to make a model that is 3D.

Answer 1

If it is for a biology class you may only need to buy some small polystyrene balls from a craftstore. Get some large ones to be the protons and neutrons. Some small ones to be electrons. You could use wire to be the 'orbits' that you can attach the small balls (electrons).

You might making atoms of biologically important elements like hydrogen, sulpher, carbon.