Krypton – Properties Summary Element Krypton Atomic Number 36 Symbol Kr Element Category Noble Gas Phase at STP Gas Atomic Mass 83.798 Density at STP 3.75 Electron Configuration 3d10 4s2 4p6 Possible Oxidation States 0 Electron Affinity - Electronegativity 3 1st Ionization Energy 13.9996 Year of Discovery 1898 Discoverer Ramsay, Sir William & Travers, Morris Thermal properties Melting Point -157.36 Boiling Point -153.22 Thermal Conductivity 0.00949 Specific Heat 0.248 Heat of Fusion 1.638 Heat of Vaporization 9. In nuclear science, the mass excess of a substance is the difference between the actual mass. The Standard English unit is pounds mass per cubic foot ( lbm/ft 3). The Isotope mass of Krypton-85 is 84.9125273(21) u. 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 Krypton 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.
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