In the modern periodic table, elements are arranged according to increasing (1 point). a. atomic number. b. atomic mass. c. date of discovery. d. electrical conductivity

Name the element in group 17, period 2. (periodic table)

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal

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)