![]() 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. 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. The nuclear binding energy varies between nuclei.This increases the mass of nuclei with more neutrons than protons relative to the atomic mass unit scale based on 12C with equal numbers of protons and neutrons. The neutron is slightly heavier than the proton.There are two reasons for the difference between mass number and isotopic mass, known as the mass defect: For example, 63Cu (29 protons and 34 neutrons) has a mass number of 63, and an isotopic mass in its nuclear ground state is 62.91367 u. The isotopic mass usually differs for other isotopes and is usually within 0.1 u of the mass number. One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol.įor 12C, the atomic mass is exactly 12u since the atomic mass unit is defined from it. One atomic mass unit is equal to 1.66 x 10 -24 grams. The unit of measure for mass is the atomic mass unit (amu). Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. See also: Properties of Copper Atomic Mass of Copper Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins, and constantan used in strain gauges and thermocouples for temperature measurement.Ĭopper – Properties Element Copper Atomic Number 29 Symbol Cu Element Category Transition Metal Phase at STP Solid Atomic Mass 63.546 Density at STP 8.92 Electron Configuration 3d10 4s1 Possible Oxidation States +1,2 Electron Affinity 118.4 Electronegativity 1.9 1st Ionization Energy 7.7264 Year of Discovery unknown Discoverer unknown Thermal properties Melting Point 1084.62 Boiling Point 2927 Thermal Conductivity 401 Specific Heat 0.38 Heat of Fusion 13.05 Heat of Vaporization 300.3 A freshly exposed surface of pure copper has a reddish-orange color. The chemical symbol for Copper is Cu.Ĭopper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. Copper is a chemical element with atomic number 29 which means there are 29 protons and 29 electrons in the atomic structure.
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