1. The following tables show the resultant matrices populated with the atomic numbers . 2. The triplet quantum yields and lifetimes both decreased with increasing atomic number . 3. The number of protons in an atom is called its atomic number . 4. A left-hand subscript is sometimes used redundantly to indicate the atomic number . 5. Relativistic effects are important for the heavier elements with high atomic numbers . 6. Hydrogen ( H ) is the chemical element with atomic number 1. 7. Boron, with its atomic number of 5, is a very light element. 8. The heaviest element occurring in nature is uranium, with atomic number 92. 9. Elements having atomic numbers greater than that of uranium are called transuranic. 10. The first half of his thesis was his work with atomic numbers .