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Câu 14. Hạt nhân $^{23}_{11} Na$

Câu 14. Hạt nhân 1123Na^{23}_{11} Na1123​Na có hiệu số giữa số hạt proton và số hạt neutron là

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Câu 14. Hạt nhân $^{23}_{11} Na$ có hiệu số giữa số hạt proton và số hạt neutron là