Zinc-67 What is the chemical symbol?
Atomic Number?
Atomic Mass?
# of Protons
# of Neutrons

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)

Helium decays to form lithium. which equation correctly describes this decay?

Rays from the sun are not considered matter true or false