Recognised as Chemical element
Beryllium
- Be
- Z = 4
- alkaline earth metal
Beryllium (Be) is element 4, an alkaline earth metal in period 2 and group 2. Its standard atomic weight is 9.0122 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolBe
Standard atomic weight9.0122atomic mass units (Da)
Mass in kilograms1.496511 × 10^-26
Categoryalkaline earth metal
Group2
Period2
Blocks-block
Electrons in a neutral atom4
Neutrons in the most common isotope5≈
Electron configuration
Configuration1s² 2s²ground state, subshells written in order of n
Noble gas shorthand[He] 2s²
Electrons per shell2, 2K, L, M and outward
Electrons in the outer shell2
Unpaired electrons0Hund's rule; none unpaired, so the free atom is diamagnetic
Madelung ruleFollowedthe ground state is what the n + l filling order predicts
Quantities
Molar mass9.0122 g/mol
Mass of one mole9.0122 grams
Atoms in one gram6.6822094 × 10^22
Mass of one atom1.496511 × 10^-23 g
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