Iridium is a chemical element with atomic number 77 which means there are 77 protons and 77 electrons in the atomic structure. Rhenium is a chemical element with atomic number 75 which means there are 75 protons and 75 electrons in the atomic structure. Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. Tantalum is […]
