Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid according to the reaction BaO2(s)+H2SO4(aq)⟶BaSO4(s)+H2O2(aq) How many milliliters of 2.50 M H2SO4(aq) are needed to react completely with 40.9 g BaO2(s)? =

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?

What are the first three quantum numbers for the electrons located in subshell 2s?

How is the atomic number of a nucleus changed by alpha decay