A sample of silver as it occurs in nature is 52.0% of Ag-107 and 48.0% of Ag-109. What is the average atomic mass of silver? (Compare your result with the value given in the periodic table).

Which element is least likely to undergo a chemical reaction

Which statement best describes the he properties of iconic compounds ?

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.