Which 2 elements have the same number of valence electrons? Group of answer choices

magnesium & sodium

sodium & potassium

hydrogen & helium

Which of the following is the best definition for the process of photosynthesis? a.) plants digest sugars to make energy. b.) plants use oxygen and glucose to make carbon dioxide. c.) plants use sunlight and carbon dioxide to make sugars. d.) plants use sunlight to make chlorophyll and chloroplasts.

Fill in the blank a scientific theory become a scientific law because only offer descriptions of the natural world, while offer robust explanations. 1. a) cannot b) can 2. a) laws b) theories 3. a) laws b) theories

Record your answer from lab exercise #1, step 1, question 1.what time in hours: minutes: seconds gmt did the p waves arrive?