The atomic number of magnesium is 12.Find the number of electrons , protons and neutrons?

For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4al(s)+3o2(g)→2al2o3(s) a) 1 molal, 1 mol o2 b) 4 molal, 2.6 mol o2 c) 16 molal, 13 mol o2 d) 7.4 molal, 6.5 mol o2

How many moles of bromine are needed to produce 3.23 moles of potassium bromide

I’m an electrically neutral atomic any element, there are equal numbers of