[填空题]
1.On the axis below, sketch the tr +l+dvnft1f oh:rqmy1a3ml:0 end in first ionization energa0;my ad-l3 mhies for the elemena0mya- ;l3 mdhts in the second period.
2. 1.Explain the general trend in first ionization energies.
2.Predict whether the first ionization energies for the third period elements will be their respective elements in the second period.