1. Hidrogeno: Z = 1. C: 1S1<br />Helio: Z =2. C: 1S2<br />Litio: Z =3. C: 1S22S1<br />Berilio: Z =4. C: 1S22S2<br />Boro: Z = 5. C: 1S22S22P1<br />Carbono: Z =6. C: 1S22S22P2<br />Nitrógeno: Z =7. C: 1S22S22P3<br />Oxigeno: Z =8. C: 1S22S22P4<br />Flúor: Z =9. C: 1S22S22P5<br />Neón: Z =10. C: 1S22S22P6<br />Sodio: Z =11. C: 1S22S22P63S1<br />Magnesio Z =12. C: 1S22S22P63S2<br />Aluminio: Z =13. C: 1S22S22P63S23P1<br />Silicio: Z =14. C: 1S22S22P63S23P2<br />Fosforo: Z =15. C: 1S22S22P63S23P3<br />Azufre: Z =16. C: 1S22S22P63S23P4<br />Cloro: Z = 17. C: 1S22S22P63S23P5<br />Argon: Z =18. C: 1S22S22P63S23P6<br />Potasio: Z =19. C: 1S22S22P63S23P64S1<br />Calcio: Z =20. C: 1S22S22P63S23P64S2<br />