WORTH 40 POINTS OK so I’m doing a science fair project and I need a title for it. The project is on amount of protein in milk. The question is what type of cows milk has the highest amount of protein.

(Also I asked once before, someone just said MOO! can you add onto that for the title?)

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

answer; talc and gypsum;

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.