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Boron (B) – Element 5 of the periodic table

Boron (symbol B) is element number 5 of the periodic table and belongs to the “Metalloid” category. Its atomic mass is about 10.81, and its phase under standard conditions is Solid. This element sits in period 2 and group 13 of the periodic table, and its electrons are arranged in shells of 2, 3. The short electron configuration of Boron is [He] 2s² 2p¹. Known uses of Boron include Borosilicate glass, Fiberglass insulation and Semiconductors.

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Properties of Boron

Atomic number
5
Chemical symbol
B
Atomic mass
10.81
Category
Metalloid
Period
2
Group
13
Phase
Solid
Protons
5
Electrons
5
Neutrons (approx.)
6
Electron shells
2, 3
Outer-shell electrons
3
Discovered
Joseph Louis Gay-Lussac (1808)

Electron configuration of Boron

The electron configuration of Boron (B), with 5 electrons, is shown below. The last shell (shell 2) is highlighted:

Full configuration
1s² 2s² 2p¹
Short configuration
[He] 2s² 2p¹
Last shell
2s² 2p¹

What is electron configuration and how is it written?

Electron shells of Boron

Distribution of 5 electrons of Boron across shells K to L:

  1. K2
  2. L3

What is a metalloid?

The metalloids have properties between metals and nonmetals, and many of them are semiconductors.

Uses of Boron

Frequently asked questions about Boron

What is the atomic number of Boron?

The atomic number of Boron (B) is 5; that is, every atom of it has 5 protons.

What is the electron configuration of Boron?

The electron configuration of Boron (B) is 1s² 2s² 2p¹; in short form it is [He] 2s² 2p¹, and its last shell is 2s² 2p¹.

What is the chemical symbol of Boron?

The chemical symbol of Boron is B.

Where is Boron located in the periodic table?

Boron is located in period 2 and group 13 and belongs to the “Metalloid” category.

What is the atomic mass of Boron?

The atomic mass of Boron is about 10.81 (atomic mass units).

What is the phase of Boron under normal conditions?

The phase of Boron under standard conditions is Solid.

What are the uses of Boron?

Uses of Boron include Borosilicate glass, Fiberglass insulation and Semiconductors.

Who discovered Boron?

Boron was discovered by Joseph Louis Gay-Lussac in 1808.

Elements in the same category as Boron (Metalloid)

Silicon (Si)Germanium (Ge)Arsenic (As)Antimony (Sb)Tellurium (Te)

See all Metalloids

Boron’s group 13 neighbours

Aluminum (Al)Gallium (Ga)Indium (In)Thallium (Tl)Nihonium (Nh)

Group 13 of the periodic table