State briefly the similarities and differences between the theories of Arrhenius and Bronsted-Lowry

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My answer to the question above is not the best example but I hope it will help you. The Arrhenius model says that acids always contain H+ and that bases always contain OH-. 
The Bronsted-Lowry model thinks of acids as being proton donors and proton acceptors, so bases no longer need to contain OH-, and acids donate a proton to water forming H3O+. 
Lewis acids are electron pair acceptors, and Lewis bases are electron pair donors. For instance, H+ + OH- => H20. H+ has no electrons, so when it bonds to the Oxygen, it gains an electron pair. OH- "loses" an electron pair.

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Enter the appropriate symbol for an isotope of potassium-39 corresponding to the isotope notation AZX.

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The notation is actually written in this way (shown in the attached picture). The X is the symbol of the element. So, for potassium, the symbol is K. The A represents the mass number of the isotope. In this case, that would be equal to 39. The Z represents the atomic number of potassium, which is 19. Therefore, the symbol for the isotope is: ³⁹₁₉K