£¨1£©Na→Na₂O→Na₂O₂→NaOH→Na₂CO₃→NaHCO₃→NaCl→Na

Na→NaOH→Na₂CO₃£¨£«CaCl₂£©→CaCO₃→CaO→Ca(OH)₂→NaOH

£¨2£©Mg→MgO→MgCl₂→Mg(OH)₂→MgSO₄→MgCl₂→Mg

£¨3£©Al→Al₂O₃→AlCl₃→Al(OH) ₃→Al₂(SO₄)₃→Al(OH)₃→Al₂O₃→Al→NaAlO₂→Al(OH)₃→Al₂O₃→NaAlO₂