To sense any signal, cells must distinguish between the signal and the background noise. for the chemical senses, the signal is the binding of a chemical to a receptor on the sensing cells. at the molecular level, background noise corresponds to thermal fluctuations in the movement of molecules. the equipartition theorem of thermodynamics states that each mode of motion at equilibrium has the energy ½ kt, where k is boltzmann’s constant and t is the temperature in °k. k = 1.38 x10-23 joule °k-1 molecule-1

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: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them