Two isotopes of chlorine are present in nature: chlorine-35 and chlorine-37. Which statement best explains their chemical behavior?
They form identical compounds
Isotopes are atoms of the same element with the same atomic number but different mass numbers. Chlorine-35 and chlorine-37 both have 17 protons and 17 electrons; they differ only in the number of neutrons (18 and 20).
Chemical properties depend on the number and arrangement of electrons. Both isotopes have the electronic configuration 2, 8, 7 and valency 1, so they behave alike chemically.
Both form HCl with hydrogen and NaCl with sodium in the same way.
Hence, the answer is They form identical compounds.
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