MCAT Question of the Day
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    Q:

    		 Which of the following best explains why the second ionization energy of Cs is higher than that of Ba?
    		 

    A

    		 Ba is more electronegative than Cs.

    B

    		 Cs has only 1 valence electron while Ba has 2.

    C

    		 Cs has a lower atomic mass than Ba.

    D

    		 The valance electrons of Ba are in a higher energy level than those of Cs.



    Atomic & Electronic Structure |
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