What kind of cycle might you learn at school?

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)

Who discovered a pattern to the elements in 1869?

In general metals get as you move from left to right across the periodic table.