biết rằng 4 nguyên tử lưu huỳnh nặng bằng 2 nguyên tử nguyên tố X. Hãy viết tên và kí hiệu hóa học của nguyên tố X

Drug abuse will not lead to physical and psychological dependence. true or false ?

Which of the following has wavelength longer than the wavelength of viable light? a) x rays b) gamma rays c) radios waves d) ultraviolet waves

According to le chatelier’s principle, a system in chemical equilibrium responds to stress by shifting the equilibrium in a direction that reduces the stress. normalizes the stress. increases the stress. changes the stress.