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Câu 16. Số nuclôn có trong hạt nhân $\;_{40}^{90}{\rm{Zr}}$

Câu 16. Số nuclôn có trong hạt nhân 4090Zr\;_{40}^{90}{\rm{Zr}}4090​Zr là:

Thông tin câu hỏi

Câu 16. Số nuclôn có trong hạt nhân $\;_{40}^{90}{\rm{Zr}}$ là: