Recognised as Chemical element
Boron
- B
- Z = 5
- metalloid
Boron (B) is element 5, a metalloid in period 2 and group 13. Its standard atomic weight is 10.81 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolB
Standard atomic weight10.81atomic mass units (Da)
Mass in kilograms1.7950427 × 10^-26
Categorymetalloid
Group13
Period2
Blockp-block
Electrons in a neutral atom5
Neutrons in the most common isotope6≈
Electron configuration
Configuration1s² 2s² 2p¹ground state, subshells written in order of n
Noble gas shorthand[He] 2s² 2p¹
Electrons per shell2, 3K, L, M and outward
Electrons in the outer shell3
Unpaired electrons1Hund's rule; unpaired electrons make the free atom paramagnetic
Madelung ruleFollowedthe ground state is what the n + l filling order predicts
Quantities
Molar mass10.81 g/mol
Mass of one mole10.81 grams
Atoms in one gram5.570898 × 10^22
Mass of one atom1.7950427 × 10^-23 g
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