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Beryllium (Be) – Element 4 of the periodic table

Beryllium (symbol Be) is element number 4 of the periodic table and belongs to the “Alkaline earth metal” category. Its atomic mass is about 9.0122, and its phase under standard conditions is Solid. This element sits in period 2 and group 2 of the periodic table, and its electrons are arranged in shells of 2, 2. The short electron configuration of Beryllium is [He] 2s². Known uses of Beryllium include Aerospace industry, Copper-beryllium alloys and X-ray machine windows.

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Properties of Beryllium

Atomic number
4
Chemical symbol
Be
Atomic mass
9.0122
Category
Alkaline earth metal
Period
2
Group
2
Phase
Solid
Protons
4
Electrons
4
Neutrons (approx.)
5
Electron shells
2, 2
Outer-shell electrons
2
Discovered
Louis Nicolas Vauquelin (1798)

Electron configuration of Beryllium

The electron configuration of Beryllium (Be), with 4 electrons, is shown below. The last shell (shell 2) is highlighted:

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

What is electron configuration and how is it written?

Electron shells of Beryllium

Distribution of 4 electrons of Beryllium across shells K to L:

  1. K2
  2. L2

What is a alkaline earth metal?

The alkaline earth metals are the group 2 elements: reactive metals, harder than the alkali metals and with higher melting points, that usually form ions with a +2 charge.

Uses of Beryllium

Frequently asked questions about Beryllium

What is the atomic number of Beryllium?

The atomic number of Beryllium (Be) is 4; that is, every atom of it has 4 protons.

What is the electron configuration of Beryllium?

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

What is the chemical symbol of Beryllium?

The chemical symbol of Beryllium is Be.

Where is Beryllium located in the periodic table?

Beryllium is located in period 2 and group 2 and belongs to the “Alkaline earth metal” category.

What is the atomic mass of Beryllium?

The atomic mass of Beryllium is about 9.0122 (atomic mass units).

What is the phase of Beryllium under normal conditions?

The phase of Beryllium under standard conditions is Solid.

What are the uses of Beryllium?

Uses of Beryllium include Aerospace industry, Copper-beryllium alloys and X-ray machine windows.

Who discovered Beryllium?

Beryllium was discovered by Louis Nicolas Vauquelin in 1798.

Elements in the same category as Beryllium (Alkaline earth metal)

Magnesium (Mg)Calcium (Ca)Strontium (Sr)Barium (Ba)Radium (Ra)

See all Alkaline earth metals

Beryllium’s group 2 neighbours

Magnesium (Mg)Calcium (Ca)Strontium (Sr)Barium (Ba)Radium (Ra)

Group 2 of the periodic table