Sodium – Properties Summary Element Sodium Atomic Number 11 Symbol Na Element Category Alkali Metal Phase at STP Solid Atomic Mass 22.9897 Density at STP 0.968 Electron Configuration 3s1 Possible Oxidation States +1 Electron Affinity 52.8 Electronegativity 0.93 1st Ionization Energy 5.1391 Year of Discovery 1807 Discoverer Davy, Sir Humphry Thermal properties Melting Point 97.8 Boiling Point 883 Thermal Conductivity 141 Specific Heat 1.23 Heat of Fusion 2.598 Heat of Vaporization 96. The Standard English unit is pounds mass per cubic foot ( lbm/ft 3). The standard SI unit is kilograms per cubic meter ( kg/m 3). In other words, the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance. It is an intensive property, which is mathematically defined as mass divided by volume: Typical densities of various substances at atmospheric pressure.ĭensity is defined as the mass per unit volume. How does the atomic mass determine the density of materials? Density of Sodium The atomic mass number determines especially the atomic mass of atoms. The mass number is different for each different isotope of a chemical element. For 63Cu, the atomic mass is less than 63, so this must be the dominant factor. A nucleus with greater binding energy has lower total energy, and therefore a lower mass according to Einstein’s mass-energy equivalence relation E = mc 2.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |