道尔顿原称 [6] [7] 原子质量单位（atomic mass unit，amu）、统一原子质量单位（unified atomic mass unit，u） [8] ，IUPAC于1993年提出以较短的名称“道尔顿”取代“统一原子质量单位” [9] [10] ，IUPAP于2005年认可了道尔顿这个名称 [11] 。

The dalton or unified atomic mass unit (symbols: Da or u, respectively) is a unit of mass defined as ⁠ 1 / 12 ⁠ of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest.

原子质量单位（amu或 u ）有时称统一原子质量单位，或 道尔顿 （Dalton，Da，D）是用来衡量原子或分子质量的单位，它被定义为碳12原子质量的1/12。 1 u = 1/NA 克 = 1/(1000 NA) 千克 (NA为 阿伏伽德罗常数 ) =1.66053886×10^-27 kg ; “ amu ”这个符号一般出现在较老的文献中。

The atomic mass of atoms, ions, or atomic nuclei is slightly less than the sum of the masses of their constituent protons, neutrons, and electrons, due to (per E = mc 2). Atomic mass is often measured in dalton (Da) or unified atomic mass unit (u). One dalton is equal to 1 ⁄ 12 the mass of a carbon-12 atom in its natural state.

Atomic Mass: 238.0289 u: Electron Configuration [Rn]7s 2 5f 3 6d 1: Oxidation States +6, +5, +4, +3: Year Discovered: 1789

The atomic mass unit (u or amu) is a relative unit based on a carbon-12 atom with six protons and six neutrons, which is assigned an exact value of 12 amu's (u's). This is the standard unit for atomic or molecular mass, and 1 amu is thus 1/12 th the mass of a 12 C atom.

Uranium is the 92nd element in the periodic table and has a symbol of U and atomic number of 92. It has an atomic weight of (238.02891) and a mass number of 238. Uranium has ninety-two protons and one hundred forty-six neutrons in its nucleus, and ninety-two electrons in …

2020年11月21日 · Atomic mass of Uranium is 238.0289 u. The atomic mass is the mass of an atom. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element.

Name: Uranium Symbol: U Atomic Number: 92 Atomic Mass: 238.0289 amu Melting Point: 1132.0 °C (1405.15 K, 2069.6 °F) Boiling Point: 3818.0 °C (4091.15 K, 6904.4 °F) Number of Protons/Electrons: 92 Number of Neutrons: 146 Classification: Rare Earth Crystal Structure: Orthorhombic Density @ 293 K: 18.95 g/cm 3 Color: silverish Atomic Structure

2022年10月21日 · The unified atomic mass unit or dalton (symbol: u, or Da) is a standard unit of mass that quantifies mass on an atomic or molecular scale (atomic mass). 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.