| A. | The properties of elements are function of atomic weights. |
| B. | The properties of elements are function of atomic numbers. |
| C. | Elements having similar outer electronic configuration are arranged in the same period. |
| D. | An element's location reflects the quantum numbers of the last filled orbital. |
| E. | The number of elements in a period is the same as the number of atomic orbitals available in energy level that is being filled. |