From the data below element first ionization energy 1 1310 kj/mol 2 1011 kj/mol 3 418 kj/mol 4 2080 kj/mol 5 947 kj/mol which elements are likely to be nonmetals? 1. 1 and 2 only 2. 2 and 5 only 3. 3 and 5 only 4. 3 only 5. 1 and 4 only