MCAT Question of the Day
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    Q:

    		 Phosphine (PH3) and ammonia (NH3) both have three hydrogen atoms because:
    		 

    A

    		 phosphorous and nitrogen are similar in their physical properties.

    B

    		 phosphorous and nitrogen are in the same group on the periodic table.

    C

    		 phosphorous and nitrogen both have stable isotopes.

    D

    		 phosphorous and nitrogen are both very electronegative and form bonds with hydrogen.



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