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given a solution with a ph of 2.8, what is the [h+] of the solution?
2.8 m
6.31 x 10-12 m
1.58 x 10-3 m
11.2 m

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?