Help me, it’s a science question

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

How many electrons does silver have to give up in order to achieve a sido noble gas electron configuration

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)