What is the difference between the mass number of an isotope and its atomic number?

Evaluate this exponential expression,8. (2 + 3)2 – 42

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride? a. magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number. b. magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number. c. magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number. d. magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.

Which of the dna typing techniques do you think you would choose if you had to analyze a dna sample? why?