関連ワード:
what element has 72 neutrons what element has 70 or 72 neutrons what element has 51 protons 72 neutrons and 51 electrons what element has 51 protons 72 neutrons what element has 53 protons and 72 neutrons what element has 50 electrons and 72 neutrons what element has 76 protons 114 neutrons and 72 electrons what element has 72 protons
