Titanium has an atomic number of 22. the following orbital notation for titanium is incorrect. explain the error in terms of the rules for electron arrangements. titanium: 1s is filled. 2s is filled. 2p is filled. 3s is filled. 3p is filled. 3d is shown with five orbitals. orbitals one through four have one electron each and the fifth orbital is empty.

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.