Which element is already stable and will not react?

Chlorine (Cl) #6
Oxygen (O) #8
Krypton (Kr) #36

Which type of substance ionizes partially and gives off hydrogen ions when dissolved in water? a. strong acid b. strong base c. weak acid d. weak base

How many moles of oxygen react with 12 moles of aluminum

In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j