The isotope that has 13 protons and 14 neutrons is Aluminum-27 (Al-27). The number of protons in an atom determines its elemental identity, so with 13 protons, it is recognized as aluminum.
The number of neutrons in the nucleus can vary among different isotopes of the same element. In this case, Aluminum-27 has 14 neutrons, making the total mass number (the sum of protons and neutrons) 27. This isotope is stable and is the most abundant naturally occurring isotope of aluminum.