Elementos parejas: David Mahamud
| __ | 1. | aluminio | | A. | Mg | | __ | 2. | argón | | B. | Na | | __ | 3. | berilio | | C. | Al | | __ | 4. | boro | | D. | B | | __ | 5. | carbono | | E. | Ar | | __ | 6. | flúor | | F. | C | | __ | 7. | fósforo | | G. | F | | __ | 8. | magnesio | | H. | P | | __ | 9. | neón | | I. | Be | | __ | 10. | sodio | | J. | Ne |
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