Oregon. A state of the northwest United States in the Pacific Northwest. It was admitted as the 33rd state in 1859. Claimed by the United States after Capt. Robert Gray explored the mouth of the Columbia River in 1792, the area was further explored by Lewis and Clark in 1805 and was soon the site of fur-trading posts.
The unified atomic mass unit (u) or Dalton ( Da) is a unit that is used for indicating mass on an atomic or molecular scale. One Da is approximately equal to the mass of one proton or one neutron. An atomic mass unit or amu is one twelfth of the mass of an unbound atom of carbon-12. This means that a carbon-12 atom has the atomic mass of 12 daltons. Mass is the property which reflects the quantity of matter within a sample.
As such, atomic weight and standard atomic weight often differ numerically from relative isotopic mass and atomic mass, and they can also have different units than atomic mass when this quantity is not expressed in unified atomic mass units (see the linked article for atomic weight). The atomic mass (relative isotopic mass) is defined as the mass of a single atom, which can only be one isotope (nuclide) at a time, and is not an abundance-weighted average, as in the case of relative atomic ...