![]() Magnesium – Properties Summary Element Magnesium Atomic Number 12 Symbol Mg Element Category Alkaline Earth Metal Phase at STP Solid Atomic Mass 24.305 Density at STP 1.738 Electron Configuration 3s2 Possible Oxidation States +2 Electron Affinity - Electronegativity 1.31 1st Ionization Energy 7.6462 Year of Discovery 1755 Discoverer Black, Joseph Thermal properties Melting Point 649 Boiling Point 1090 Thermal Conductivity 156 Specific Heat 1.02 Heat of Fusion 8.954 Heat of Vaporization 127. 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 Magnesium ![]() 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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