De los siguientes ejemplos, subraya aquellos cuya composición pueda se estudiad por la química •proteínas •manzanas
•papel •medicamento
•televisor •tortillas

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.