39. Chlorine exists naturally as a mixture of chlorine-35 and chlorine-37 isotopes. An atom of chlorine-35 contains(A)17 protons, 18 neutrons, 17 electrons.(B)16 protons and 17 electrons, only.(C)18 protons, 18 electrons, and 17 neutrons.(D)17 protons, 35 neutrons, and 17 electrons.

10. Which of the following statements is false?(A)For monoelectron atom, the 4s orbital lies lower in energy than the 5s orbital.(B)For a potassium atom, a 4s orbital, a 4p orbital, and a 4d orbital all have the same energy.(C)For a hydrogen atom, a 4s orbital, a 4p orbital, and a 4d orbital all have the same energy.(D)The 4s orbital lies lower in energy than the 3d orbital for atoms K, Ca, Sc, and Ti.

39. Chlorine exists naturally as a mixture of chlorine-35 and chlorine-37 isotopes. An atom of chlorine-35 contains
(A)17 protons, 18 neutrons, 17 electrons.
(B)16 protons and 17 electrons, only.
(C)18 protons, 18 electrons, and 17 neutrons.
(D)17 protons, 35 neutrons, and 17 electrons.

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