Which of the following descriptions apply to valence electrons

What term is missing from the central region that describes hypotheses, theories, and laws? popular predictable mathematical falsifiable

Which is an example of the practical pursuit of alchemy? a. forming perfect substances. b. transforming base metals. c. developing metalworking techniques. d. linking spiritual characteristics with material substances.

Which of the following is not an assumption that scientists must make about the natural world? a. regularity b. causality c. predictability d. plausibility