MCAT Question of the Day
    •

    Q:

    		 Which of the following is true regarding the mass number for an atom?
    		 

    A

    		 It is equivalent to the number of protons.

    B

    		 It is equivalent to the sum of the protons and electrons.

    C

    		 It differs for different isotopes of the same atom.

    D

    		 It decreases going leftward along a group on the periodic table.



    Periodic Table |
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