The three common isotopes of magnesium have masses of 25, 26, and 27 amu. The differences in mass are attributed to the number of (the multiple choice answers are in the picture above) :)

it about 600 mph from what i calculated

first thing first of the answer is with technology. second thing second thing is that the big bang theory did not happened u see they say it did but what they dont realize is that like dinasures are still a round they might deny it but they and look at these 12 foot human skelteons they find lets see didnt the bible say something about giants. hope this peace.