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nguyên tử M và N đều có lớp electron ngoài cùng là lớp M và có tổng số electron Hóa trị là 9 biết m là nguyên tố s, n là phi kim. cho biết M,N thuộc nhóm nào trong bảng tuần hoàn

Sagot :

Manisphesto

Answer:

ummm

Explanation:

English, not Vietnamese

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