Final answer:
Potassium (K) is the element with four energy levels and one valence electron, as it belongs to Group 1 in the periodic table and has its valence electron in the 4s orbital.
Step-by-step explanation:
The element that has four energy levels (or rings) and one valence electron is potassium (K). Elements are organized in the periodic table according to their electron configuration, and the number of valence electrons determines the group in which an element is located. Potassium is found in Group 1, which contains elements that all have a single valence electron. Moreover, potassium's electron configuration ends in 4s¹, indicating that it is the fourth period element with one valence electron in the 4s orbital.