関連ワード:  what is found in the nucleus of atom    what is contained in the nucleus of atom    what is not found in the nucleus of an atom    what particle is found in the nucleus of an atom    what subatomic particle is found in the nucleus of an atom    what neutral particle is found in the nucleus of an atom    what is present inside the nucleus of atom    what is found outside the nucleus of an atom    what particle is located in the nucleus of an atom    what particle is not found in the nucleus of an atom