sentence2_structure: A carbon atom with 6 protons and 8 neutrons<>is<>more specifically known as carbon 14$$$A carbon atom with 6 protons and 8 neutrons<>more specifically known<>as carbon 14
sentence1: The atomic nuclei of these isotopes all contain 6 protons, which defines them as carbon, but they have 6, 7 and 8 neutrons, respectively, which gives them different masses.
sentence2: A carbon atom with 6 protons and 8 neutrons is more specifically known as carbon 14.
question: A carbon atom with 6 protons and 8 neutrons is more specifically known as?