Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
동중성자핵은 같은 원자 번호를 가지지만 다른 질량을 가진 원소입니다.dongjungseongjahaegeun gat-eun wonja beonhoreul gajijiman daleun jilsang-eul gajin wonsoimnida.An isotope has the same atomic number but a different mass.