3 CHEMISTRY-RELATIVE ATOMIC MASS the mass of a hydrogen atom 1/1H is equal to 1/12 of the mass of a carbon-12 atom, so its relative isotopic mass is 1.A magnesium atom 24/12Mg is twice as heavy as a carbon-12 atom,so its relative isotopic mass is 24 再给另一个例子 不要用英文...
Define atomic mass. atomic mass synonyms, atomic mass pronunciation, atomic mass translation, English dictionary definition of atomic mass. n. The mass of an atom, usually expressed in atomic mass units. American Heritage® Dictionary of the English La
Each12C atom has six protons and six neutrons in its nucleus, adding up to an atomic mass of 12 AMU.Electronshave a low mass, so they are assumed to have a negligible effect. Consequently, the nucleus accounts for almost the entire mass of the atom of any element, which means that a ...
The atomic mass of an element is the total mass of its protons, neutrons, and electrons. On the Periodic Table of Elements, the atomic number of an element is equivalent to its number of protons.Answer and Explanation: The average atomic mass of hydrogen is 1.008. The average atomic mass ...
1 The relative atomic mass of an element is always D A the mass of an atom of the element relative to z the mass of a carbon-12 atom. B the mass of an atom of the element relative to the mass of a hydrogen atom.□ C the weighted mean mass of an atom of the element relative ...
The mass of a neutron is 1.008 665 u while that of the hydrogen atom is 1.007 825 u. Since both neutrons and protons have almost unit atomic masses, the atomic mass of a nuclide should be close to the number of nucleons, i.e. the mass number. However, when the table of elements ...
The relative atomic mass of an element is defined as the weight in grams of the number of atoms of the element contained in 12.00 g of carbon-12. Alternatively, the relative atomic mass of an element is given by the mass of one atom of the element1/12 of the mass of one atom of ...
AMU Atomic mass unit, defined so that the mass of the commonest carbon isotope is 12 amu, making the mass of the hydrogen atom approximately equal to 1 amu.Borysow, A., and L. Frommhold, "Theoretical collision-induced roto-translational absorption spectrafor modelling Titan's atmosphere ...
Using a mass spectrometer, physicists have determined the mass of a hydrogen atom to be 1.660538921(73) × 10-27 kilograms, where the parenthetical digits are not known with complete certainty. That's accurate enough for most purposes. Good vibrations Another way that the mass of an atom can...