An atom's tendency is to become stable. what does this mean? a. the electrons all move to one electron shell. b. the atom gains or loses neutrons to match the number of protons. c. the atom gains or loses electrons to match the number of protons. d. the atom gains or loses electrons so its outer electron shell is full.

Which of the following is most likely true about water in chemical systems? a) water dissolves nonpolar ionic compounds. b) water dissociates ionic compounds. c) water dissociates covalent molecules. d) water dissolves nonpolar covalent substances.

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.

Select the correct lewis structure for fluorine which is group 7a element?