Atomic Number
13
Element 13
Aluminum (Al)
Aluminum is a chemical element with symbol Al and atomic number 13. It is a silvery-white, soft, nonmagnetic, ductile metal in the boron group.
Atomic Mass
26.982 u
Category
Post-Transition Metal
Period
3
Group
Group 13: boron group
Phase
solid
Density
2.7 g/cm3
Electron Shells
2, 8, 3
Atomic Structure
Protons: 13. Electrons: 13. Neutrons: Varies by isotope.
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p¹
Why Aluminum Matters
Aluminum helps connect atomic number 13, post-transition metal behavior, period 3 trends, and electron shell structure. Its solid phase, atomic mass of 26.982 u, and electron configuration 1s² 2s² 2p⁶ 3s² 3p¹ make it useful for comparing bonding patterns across the periodic table.
Discovery and Occurrence
Aluminum was discovered 1824 by Hans Christian Ørsted. Aluminum is a chemical element with symbol Al and atomic number 13. It is a silvery-white, soft, nonmagnetic, ductile metal in the boron group.
Safety and Handling Context
Aluminum is presented here for learning and comparison. Pure elements and laboratory compounds can have hazards that depend on dose, form, and setting.
Related Elements
Frequently Asked Questions
- What is the atomic number of Aluminum?
- Aluminum has atomic number 13, which means a neutral atom has 13 protons and 13 electrons.
- What is the chemical symbol for Aluminum?
- The chemical symbol for Aluminum is Al.
- What category is Aluminum in?
- Aluminum is classified as a post-transition metal and sits in period 3 of the periodic table.
Explore Aluminum in 3D
Use the interactive table above to rotate atomic models, compare periodic trends, and move from Aluminum to neighboring elements without losing your place.