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2. I A II A Berilio Be Z = 4 1 S2 - 2 S22 S2 Cesio; Cs Z = 55 1 S2 2S2 2 P6 3 S2 3 P6 4S2 3D10 4 P6 5 S2 4 D10 5 P6 6 S1 6 S1 3. Escandio Sc Z = 21 1 S2 2S2 2 P6 3 S2 3 P6 4S2 3D1 Zn Z = 30 1 S2 2S2 2 P6 3 S2 3 P6 4S2 3D10 4. Boro B Z = 5 1 S2 - 2 S2 2 P1 Yodo I Z = 53 1 S2 2S2 2 P6 3 S2 3 P6 4S2 3D10 4 P6 5 S2 4 D10 5 P5 5. Lantano. La Z = 57 1 S2 2S2 2 P6 3 S2 3 P6 4S2 3D10 4 P6 5 S2 4 D10 5 P6 6 S2 4 F1 Tulio. Tm Z = 69 1 S2 2S2 2 P6 3 S2 3 P6 4S2 3D10 4 P6 5 S2 4 D10 6 2 13