Step 7: Put the Metal in the water and Measure Temperature Changes (Copper) Initial temperature of metal = 100°c
Initial temperature of water = 22.7°C
Final temperature of both
24.6°C
Subtract to find the temperature changes
for the water and the metal.
AT (water) = 1.9
AT (metal) = -75.4

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

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

the awnser is group 12