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hanhvy451
2 năm trước
: Trong 1 nguyên tử Fe có 30 nơtron. Tính số nơtron có trong 16,8 gam sắt. Câu : Chỉ rõ đơn chất, hợp chất, hợp chất vô cơ, hợp chất hữu cơ: Al, Mn, C2H6, KCN, HCOOH, BaCO3, H2NCH2COOH, S, Cl2, HF, Mg(HCO3)2, HCN, CH5N Vẽ sơ đồ sự phân bố các electron của các nguyên tử hiđro, cacbon, lưu huỳnh. Xác định số lớp electron, số electron trên mỗi lớp và số electron lớp ngoài cùng của các nguyên tử trên Tính khối lượng một nguyên tử của Na, Mg và C theo đơn vị u và gam
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