What do all electrolytes have in common?
A. They are compounds of carbon.
B. They have low melting points.
C. They have mobile ions in solution.

The modern periodic table has groups.

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.

An atom that gains or loses one or more electrons is called a(n)