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 Cobalt Atomic Mass of Cobalt
#Cobalt element symbol free
The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.Ĭobalt – Properties Element Cobalt Atomic Number 27 Symbol Co Element Category Transition Metal Phase at STP Solid Atomic Mass 58.9332 Density at STP 8.9 Electron Configuration 3d7 4s2 Possible Oxidation States +2,3 Electron Affinity 63.7 Electronegativity 1.88 1st Ionization Energy 7.881 Year of Discovery 1735 Discoverer Brandt, Georg Thermal properties Melting Point 1495 Boiling Point 2927 Thermal Conductivity 100 Specific Heat 0.42 Heat of Fusion 16.19 Heat of Vaporization 376.5 The chemical symbol for Cobalt is Co.Ĭobalt is found in the Earth’s crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure.
0 kommentar(er)
