Zinc is an essential micromineral that supports DNA synthesis, bone growth, and fortifies the immune system. Determine its mass number if there are 38 neutrons in its nucleus. The atomic number for zinc is 30 a) 66 b) 30 c) 36 d) 68 Calculate the atomic mass for the following element and then use the mass and the periodic table to identify it. Neon Sodium Beryllium Helium Boron Magnesium has three naturally occurring isotopes with the natural abundance of each isotope as a percentage of the total written in parentheses: magnesium-24 (78.70\%), magnesium-25 (10.13\%), and magnesium-26 (11.17\%). Which isotope of magnesium is most abundant on earth? Mangeisum-24 Mangeisum-25 Mangeisum-26 None of the above