d) bromine (VII) and oxygen: __ 5. Which three of the following elements have atoms with four energy levels in their ground state? 1) Zn 2) P 3) As 4) F 5) K

The correct answer is 1) Zn, 3) As, and 5) K.<br /><br />Explanation:<br />1) Zinc (Zn) has an atomic number of 30, which means it has 30 protons in its nucleus. The electron configuration of zinc is [Ar] 3d10 4s2, indicating that it has electrons in the 4s and 3d energy levels. Therefore, zinc has four energy levels in its ground state.<br /><br />3) Arsenic (As) has an atomic number of 33, which means it has 33 protons in its nucleus. The electron configuration of arsenic is [Ar] 3d10 4s2 4p3, indicating that it has electrons in the 4s and 4p energy levels. Therefore, arsenic has four energy levels in its ground state.<br /><br />5) Potassium (K) has an atomic number of 19, which means it has 19 protons in its nucleus. The electron configuration of potassium is [Ar] 4s1, indicating that it has electrons in the 4s energy level. Therefore, potassium has four energy levels in its ground state.<br /><br />On the other hand, phosphorus (P) has an atomic number of 15, which means it has 15 protons in its nucleus. The electron configuration of phosphorus is [Ne] 3s2 3p3, indicating that it has electrons in the 3s and 3p energy levels. Therefore, phosphorus has three energy levels in its ground state, not four.<br /><br />Therefore, the three elements that have atoms with four energy levels in their ground state are zinc (Zn), arsenic (As), and potassium (K).