Give 1 physical property and 1 chemical property of a piece of paper.

The chemical properties that make up paper are flammability, non flammability, decomposition, lack of decomposition at high temperatures.

Physical properties of paper sheets are determined by basis weight, thickness, density, two-sidedness, smoothness, permeability, handle, rigidity, roughness, and porosity, which in turn affect sheet properties of softness, hardness, compressibility, dimensional stability, curl, and strength

Explanation:

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.