Electrons are able to "move" around the atom in set energy states in different orbitals, because the electrons "move" so fast around the nucleus where they are is just represented with an area of probability since their location and velocity cannot be measured with certainty. Protons and Neutrons are packed tightly in the nucleus held together by the strong nuclear force so they are not able to freely move.
B) decreasing the reactants particle size
Answer:
Cement is a compound mixdure, so cannot be an element.
Explanation:
No it is a chemical change.
