4 Be Beryllium 9.0122 u

Beryllium

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周期
2
族
2
ブロック
s-ブロック
相 (STP)
Solid

Beryllium is a lightweight alkaline earth metal with high stiffness. It is used in aerospace materials and X-ray windows.

外観: 白灰色の金属

About Beryllium

Isolated in principle by Louis Nicolas Vauquelin in 1798, beryllium is a hard, white-gray alkaline earth metal with atomic number 4 and an atomic mass of 9.01. It is light yet stiff, with a density of 1.85 g/cm³ and a high melting point of 1560 K. Two valence electrons in the [He] 2s2 configuration give an electronegativity of 1.57 and a first ionization energy of 900 kJ/mol. Beryllium is transparent to X-rays, which suits it to radiation windows, and its rigidity relative to weight makes it valuable in aerospace materials. Placed in group 2, period 2, the free metal does not occur naturally and must be extracted from minerals.

物理的特性

原子質量 9.0122 u
密度 1.85 g/cm³
融点 1286.8 °C
沸点 2468.8 °C
STPにおける相 Solid
原子半径 112.0 pm

電子的特性

電気陰性度 1.57
イオン化エネルギー 899.5 eV
価電子 2

電子配置

配置 [He] 2s²

Electron Shell Configuration

Beryllium electron shell configuration Be 2e⁻ 2e⁻
Electron shell structure of Beryllium — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 2

Position in Periodic Table

Beryllium position in the periodic table Be

発見

発見者: Louis Nicolas Vauquelin
年: 1798

ブロックと周期

ブロック

s p d f

周期

1 2 3 4 5 6 7

周期表

ランタノイド アクチノイド

Be を含む反応

Formation of Beryllium Oxide

2Be + O₂ → 2BeO

Synthesis

Electron Capture by Beryllium-7

⁷Be + e⁻ → ⁷Li + νₑ

Nuclear

Compounds Containing Beryllium

Beryllium Oxide

BeO

アルカリ土類金属 をもっと見る

12 Mg Magnesium 20 Ca Calcium 38 Sr Strontium 56 Ba Barium 88 Ra Radium

Explore on Science FYI

GemFYI
Emerald

Beryllium aluminum silicate colored by chromium
GemFYI
Aquamarine

Blue-green beryl variety
MineralFYI
Beryl

Primary beryllium mineral

Frequently Asked Questions

What is Beryllium?
Beryllium (Be) is a chemical element with atomic number 4. It is a solid at standard temperature and pressure, classified as a アルカリ土類金属.
What are the key properties of Beryllium?
Beryllium has an atomic mass of 9.0122 u, density of 1.85 g/cm³, melting point of 1286.8°C, boiling point of 2468.8°C.
What is the electron configuration of Beryllium?
The electron configuration of Beryllium is [He] 2s2. It is in the s-block of the periodic table.
Who discovered Beryllium?
Beryllium was discovered by Louis Nicolas Vauquelin in 1798.
What is the electronegativity of Beryllium?
Beryllium has an electronegativity of 1.57 on the Pauling scale.