nguyên tử khối trung bình của Nito là 14,0036. biết Clo cso 2 đòng vị , tromg đó đồng vị 37 Cl chiếm 24,23% số nguyên tử Clo. tính thành phần % về khối lượng 37 Cl trong HClO4

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)