The atomic number of an element is determined by the number of protons in its nucleus. In our current understanding of physics, the laws governing the structure of atoms and the periodic table are based on fundamental principles. The concept of atomic number and the arrangement of elements in the periodic table are deeply rooted in our understanding of quantum mechanics.
If we were to change the laws of physics, it would involve a fundamental alteration of the principles that govern the behavior of matter and energy. In such a hypothetical scenario, it is possible to imagine a different set of physical laws that would lead to alternative atomic structures and arrangements. Consequently, it would be conceivable for an element other than iron to have an atomic number of 26.
However, it's important to note that the laws of physics as we currently understand them have been extensively tested and validated through experimental evidence. Altering these laws would have far-reaching consequences, affecting the behavior of all matter and energy, and potentially rendering our current understanding of chemistry and the periodic table obsolete.
While it is interesting to speculate about alternative physical laws, it's important to recognize that any proposed changes would require substantial evidence and a robust scientific framework to support them. As of now, our understanding of the laws of physics, including the atomic number and the periodic table, is firmly grounded in well-established theories and experimental observations.