This is a series of chemical reactions involving the element Phosphorus (P) and Magnesium (Mg).

P reacts with O2 to form P2O5 (Phosphorus pentoxide).P2O5 reacts with H2O to form H3PO4 (Phosphoric acid).H3PO4 reacts with Mg(OH)2 (Magnesium hydroxide) to form Mg3(PO4)2 (Magnesium phosphate).Mg3(PO4)2 reacts with H2O to form Mg(OH)2.Mg(OH)2 decomposes to form MgO (Magnesium oxide).MgO reacts with HNO3 to form Mg(NO3)2 (Magnesium nitrate).

This series of reactions demonstrates how Phosphorus and Magnesium can undergo various chemical transformations to form different compounds.