Electrons can only inhabit certain energy levels. What determines the values of the energy levels of an atom?

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Drug abuse will not lead to physical and psychological dependence. true or false ?

Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. a solution containing 3.50 g of sodium carbonate is mixed with one containing 5.00 g of silver nitrate. how many grams of sodium carbonate, silver nitrate, silver carbonate, and sodium nitrate are present after the reaction is complete?