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| 1. |
List the symbols and atomic numbers of first 20 elements |
| Answer» FIRST 20 ELEMENTS FORM PDH-1He-2 Li-3 Be-4B-5C-6N-7O-8F-9Ne-10Na-11Mg-12Al-13Si-14P-15s-16Cl-17Ar-18k-19Ca-20I HOPE THIS INFO HELPS U ☺️☺️☺️☺️ | |