What must be true about electrons sharing the same atomic orbital? a. they must have absorbed different amounts of energy. b. they must have opposite charges. c. one is negatively charged, the other is neutral. d. they must have opposite spins.

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

Which of the following best describes the formation of plasma?

Between 2014 and 2016, more than 25,000 children in flint, michigan, drank water that was contaminated with lead from lead pipes. during this time, the city claimed the water was safe to drink. which of these actions could the city have taken to ensure that the drinking water was free from lead?