What tools would you need to use if you are going to make the measurements necessary to calculate the density of a rock

I believe you would use a graduated cylinder mark the volume inital volume of the cylinder and then the final

then minus the final volume - the inital to give the volume

then you would put the rock on a scale and get the mass

then you use the "equation of love"

mass/ volume = density

m/v = density

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6