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2. An element's atomic number is equal to
A. the number of protons in its nucleus.
B. the number of neutons in its nucleus.
C. the number of protons and electrons in its nucleus.
D. the number of protons and neutrons in its nucleus.
Check Answer

The continuous release of nuclear energy caused when one fission reaction triggered more nuclear reactions is a

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

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.