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nguyenkimkhanh778
2 năm trước
1)Tổng số proton của 2 nguyên tố A và B là 50.Biết A,B là 2 nguyên tố thuộc cùng một nhóm và ở 2 chu kì liên tiếp nhau.A,B là 2 nguyên tố nào? 2)Cho 5,6 gam hỗn hợp hai kim loại A,B thuộc 2 chu kì liên tiếp và thuộc cùng nhóm IA,tác dụng với dung dịch HCl dư thu được 3,584 lít (đktc) $H_2$.Tìm nguyên tố A,B
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