Ametal cylinder is placed in a graduated cylinder which has been filled with water to the 70.0 ml mark. the water level rises to the 78.0 ml mark. what is the volume of the metal cylinder?

Explanation V= New mL displaced water - original old water that was already in the grad. cylinder basically 8.0 mL:

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

it is stable as it is in group 0 which have full outer shells of electrons