What are the elements of ca0 ?

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

Achemist 16 drop copper metal from copper chloride solution. the chemist place is 0.50 g of aluminum foil in a solution containing 0.75 g of copper (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction?

In salt water solution,the salt is the blank