What makes an element reactive

The number of electrons in the outermost shell of an atom determines its reactivity.

Explanation:

the correct answer is:

a. formation of precipitation

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