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It is well known that the element magnesium has three naturally occurring isotopes. Mg-24 represents 79.0% of all magnesium atoms, Mg-25 accounts for 10.0%, and Mg-26 is the remaining 11.0%. If you have 234. atoms of magnesium, how many should be Mg-24?

Verified Answer :

Take your total number of atoms which is 234 atoms. 
then calculate the atoms for Mg-24 and Mg-25 add them together then take that away from the total of 234 to find the answer
234 x 0.79=184.86
234 x 0.10= 23.4
184.86+23.4=208.26
234-208.26=25.74-Final answer

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