26. What is the important precaution observed in the storage of metallic sodium?(A)Leave the container uncoverd(B)Store the sodium in kerosene(C)Store the sodium in water(D)Use an opaque container

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.

26. What is the important precaution observed in the storage of metallic sodium?
(A)Leave the container uncoverd
(B)Store the sodium in kerosene
(C)Store the sodium in water
(D)Use an opaque container

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