Recognised as Chemical element
Aluminium
- Al
- Z = 13
- post-transition metal
Aluminium (Al) is element 13, a post-transition metal in period 3 and group 13. Its standard atomic weight is 26.982 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolAl
Standard atomic weight26.982atomic mass units (Da)
Mass in kilograms4.4804665 × 10^-26
Categorypost-transition metal
Group13
Period3
Blockp-block
Electrons in a neutral atom13
Neutrons in the most common isotope14≈
Electron configuration
Configuration1s² 2s² 2p⁶ 3s² 3p¹ground state, subshells written in order of n
Noble gas shorthand[Ne] 3s² 3p¹
Electrons per shell2, 8, 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 mass26.982 g/mol
Mass of one mole26.982 grams
Atoms in one gram2.2319104 × 10^22
Mass of one atom4.4804665 × 10^-23 g
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