1.H --------16. S2.He ------17.Cl3.Li --------18.Ar4.Be -------19.K5.B --------20. Ca6.C --------21.Sc7.N ---------22.Ti8.O --------23.V9.F ---------24.Cr10.N--------25.Mn11.Na-------26.Fe12.Mg------27.Co13.Al--------28.Ni14.Si--------29 .Cu15.P---------30.Zn
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