m). The number of neutrons depends on the isotope, but would be around 118. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements. Number of Neutrons Origin of Name: From the Old English word geolo, meaning yellow: Date and Place of Discovery: Known to the ancients, circa 3,000 B.C. Name A low resistivity indicates a material that readily allows the flow of electric current. who ever gave you guys that answer was wrong. Links, Show Table With: Number of Protons: 79: Number of Neutrons: 118: Number of Electrons: 79: Melting Point: 1064.43° C: Boiling Point: 2807.0° C: Density: 19.32 grams per cubic centimeter: Normal Phase: Solid: Family: Transition Metal: Period : 6: Cost: $500 an ounce . So there’s only one stable isotope. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. D. Neutrons and protons in atoms have nearly equal mass. To understand the difference betweenÂ metals,Â semiconductorsÂ andÂ electrical insulators, we have to define the following terms from solid-state physics: A possible crystal structure of Gold is face-centered cubic structure.