Answer:
When substances made of iron are exposed to oxygen and moisture (water), rusting takes place. Rusting removes a layer of material from the surface and makes the substance weak. Rusting is a chemical change.
Bohr’s model showed that electron orbits had distinct radii.
Rotational speed of an object around an axis is the numbers of turns of the object divided by time. <span />
私は英語がわかりません sorry pls translate
