No, it is not possible for an element to have a negative ion charge and a positive atomic number at the same time. The atomic number of an element represents the number of protons in its nucleus, which is always a positive value. It defines the element's identity and determines its position in the periodic table.
On the other hand, the ion charge of an element refers to the net electrical charge of an atom or group of atoms when it gains or loses electrons. When an atom gains electrons, it becomes negatively charged, forming a negative ion or anion. When an atom loses electrons, it becomes positively charged, forming a positive ion or cation.
The ion charge is denoted using a superscript following the atomic symbol. For example, an oxygen atom (O) with a gain of two electrons becomes an oxygen ion with a charge of -2, denoted as O2-. In this case, the atomic number of oxygen remains the same (8), while its ion charge changes.
In summary, the atomic number of an element remains fixed and positive, while the ion charge can vary depending on whether the element gains or loses electrons. However, the atomic number and ion charge cannot have opposite signs simultaneously.