5 B 10.81
Boron
metalloid
Properties
- Atomic number
- 5
- Atomic mass
- 10.81 u
- Category
- metalloid
- Group
- 13
- Period
- 2
- Block
- p-block
- State (room temp)
- Solid
- Outer-shell electrons
- 3
- Electronegativity
- 2.04 (Pauling)
- Density
- 2.08 g/cm³
- Melting point
- 2075.85 °C
- Boiling point
- 3926.85 °C
Electron configuration
1s² 2s² 2p¹
Noble-gas shorthand: [He] 2s² 2p¹
Electrons per shell: 2, 3, which is 3 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
About Boron
Boron is a metalloid chemical element with symbol B and atomic number 5. Produced entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, it is a low-abundance element in both the Solar system and the Earth's crust. Boron is concentrated on Earth by the water-solubility of its more common naturally occurring compounds, the borate minerals.
- Discovered by Joseph Louis Gay-Lussac
- Appearance: black-brown
Boron: frequently asked questions
- What is Boron?
- Boron (B) is the chemical element with atomic number 5. It is a metalloid, with properties between metals and nonmetals.
- What is the atomic number of Boron?
- Boron's atomic number is 5, which means every Boron atom has 5 protons in its nucleus.
- What is the electron configuration of Boron?
- The electron configuration of Boron is 1s2 2s2 2p1 (noble-gas shorthand: [He] 2s2 2p1). Its electrons are arranged in shells of 2, 3, with 3 in the outermost shell.
- Is Boron a metal or a nonmetal?
- Boron is a metalloid, with properties between metals and nonmetals.
- What group and period is Boron in?
- Boron is in group 13 and period 2 of the periodic table.
- Is Boron a solid, liquid, or gas?
- At room temperature, Boron is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.