Yes. Aluminum is a metal, classified as a post-transition metal on the periodic table.

How many protons does aluminum have?

Aluminum has 13 protons. Its atomic number is 13, which is also the number of electrons in a neutral atom of aluminum.

What group and period is aluminum in?

Aluminum is in group 13 and period 3 of the periodic table, in the p-block.

What is the atomic mass of aluminum?

The atomic mass of aluminum is 26.982 u (unified atomic mass units).

Element 13

Aluminum (Al)

Post-transition metal · Period 3 · Group 13 · p-block

Aluminum (Al) is element 13 of the periodic table, a post-transition metal in period 3, group 13 (p-block) with an atomic mass of 26.982 and is a solid at standard conditions.

At a glance

Atomic number: 13
Symbol: Al
Atomic mass: 26.982 u
Category: Post-transition metals
Period: 3
Group: 13
Block: p-block
Phase at STP: solid

Electron structure

Electron configuration: 1s2 2s2 2p6 3s2 3p1
Shorthand configuration: [Ne] 3s2 3p1
Electrons per shell: 2, 8, 3
Oxidation states: +1, +3

Physical properties

Melting point: 933.47 K (660.32 °C)
Boiling point: 2,792 K (2,518.85 °C)
Density: 2.698 g/cm³
Phase: solid

Atomic properties

Electronegativity (Pauling): 1.61
Atomic radius: 118 pm
Covalent radius: 121 pm
Van der Waals radius: 184 pm
First ionization energy: 578 kJ/mol
Electron affinity: 43 kJ/mol

Notable isotopes

Notable isotopes of Aluminum: mass number, atomic mass, natural abundance, and stability.
Isotope	Mass	Abundance	Stability
Al-27	26.98154	100%	Stable

Common uses

Packaging
Construction
Transportation
Electronics

Discovery

Year: 1825
Discovered by: Hans Christian Ørsted
Country: Denmark

Frequently asked questions

Is aluminum a metal?: Yes. Aluminum is a metal, classified as a post-transition metal on the periodic table.
How many protons does aluminum have?: Aluminum has 13 protons. Its atomic number is 13, which is also the number of electrons in a neutral atom of aluminum.
What group and period is aluminum in?: Aluminum is in group 13 and period 3 of the periodic table, in the p-block.
What is the atomic mass of aluminum?: The atomic mass of aluminum is 26.982 u (unified atomic mass units).

Keep exploring

Aluminum's row is on the printable element property sheet, and its tile is on the periodic table wall chart - the same numbers as above, laid out for A4 or A3 paper.