A proton is an atom that has lost a valence electron and therefore has more positive protons than Negative electrons so it is positively charged
It results in a chemical reaction called neutraluization.
Answer:
80g=0.08kg
20cm=0.02m
density=m/v
= 0.08/0.02
=4kg/m^3
it is less than density of water so it floats
The fossil could get damaged and broken into smaller pieces. That is a way it could make it difficult to determine the fossils age.
Physical properties include color, smell, texture etc which can be easily observed but chemical properties include mass, volume reactivity which can only be observed when any changes in the chemical identity of the substance takes place.