Beryllium is the chemical element with atomic number four. Its isotope beryllium-7 provides an important route to primordial lithium-7.
An isotope of beryllium with 4 protons and 6 neutrons. Its nuclear spin concerns the coupled nuclear quantum state, not the electronic configuration.
Beryllium-7 contains four protons and three neutrons. It forms in reactions including and becomes lithium-7 through electron capture. In the early universe its ionization state affects when capture occurs, so the final primordial lithium inventory includes the earlier beryllium inventory rather than just lithium present when nuclear burning ends.
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Beryllium is a chemical element with the symbol Be and atomic number 4. It is a grayish-white metallic element that is part of the alkaline earth metals group in the periodic table. Beryllium is known for its high stiffness, low density, and excellent thermal and electrical conductivity. Some key properties of beryllium include: - **Atomic Mass**: Approximately 9.0122 u. - **Density**: About 1.