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The monomer BH 3 is unstable since the boron atom has an empty p-orbital. A B−H−B 3-center-2-electron bond is formed when a boron atom shares electrons with a B−H bond on another boron atom. The two electrons (corresponding to one bond) in a B−H−B bonding molecular orbital are spread out across three internuclear spaces. [1]
The headquarters is located in the History Museum (Romanian: Muzeul de Istorie din Suceava), in the center of Suceava. The History Museum is the oldest part of the Bukovina Museum and essentially the nucleus around which the complex with its various facilities was built. The History Museum was built in 1898 and is now a cultural heritage site. [2]
The energy levels in the atom for the single lines are indicated by 1 S 0 1 P 1 1 D 2 1 F 3 etc., and for the triplets, some energy levels are split: 3 S 1 3 P 2 3 P 1 3 P 0 3 D 3 3 D 2 3 D 1 3 F 4 3 F 3 3 F 2. [2] Alkaline earths and mercury also have spectra with similar features, due to the two outer valence electrons. [2]
Bukovina Village Museum (Romanian: Muzeul Satului Bucovinean) is an open-air museum that highlights the traditional cultural and architectural heritage of Bukovina region. It is located in the eastern part of Suceava, near the Seat Fortress.
English: The renovated history museum of Bukovina is a historical building situated in the town centre of Suceava, seat of Suceava County, north-eastern Romania Date 11 August 2020, 16:08:35
The trihydrogen cation or protonated molecular hydrogen (IUPAC name: hydrogenonium ion) is a cation (positive ion) with formula H + 3, consisting of three hydrogen nuclei sharing two electrons. The trihydrogen cation is one of the most abundant ions in the universe.
For instance, lithium, atomic number 3, has two electrons in the 1s shell and one in the 2s shell. Because the two 1s electrons screen the protons to give an effective atomic number for the 2s electron close to 1, we can treat this 2s valence electron with a hydrogenic model.
In this way, the electrons of an atom or ion form the most stable electron configuration possible. An example is the configuration 1s 2 2s 2 2p 6 3s 2 3p 3 for the phosphorus atom, meaning that the 1s subshell has 2 electrons, the 2s subshell has 2 electrons, the 2p subshell has 6 electrons, and so on.