88 Ra Radium 226.0 u

Radium

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周期
7
族
2
ブロック
s-ブロック
相 (STP)
Solid

Radium is a radioactive alkaline earth metal discovered by Marie and Pierre Curie. It glows faintly blue due to its intense radioactivity.

About Radium

The isolation of radium by Marie and Pierre Curie gave radioactivity its first widely recognised chemical subject. The element occupies atomic number 88 with a relative atomic mass of 226.0, and its [Rn] 7s2 configuration places it in group 2 of period 7 as the heaviest alkaline earth metal. Its electronegativity is 0.9 and it is a solid at standard temperature and pressure. Radioactivity in radium is intense enough to excite the surrounding air and the compound matrix, which is why preparations of the element glow with a faint blue light without any external stimulus. That luminescence, once exploited commercially in self-luminous paints, is now understood as a direct visual signature of the ionising radiation that makes the element hazardous to handle.

物理的特性

原子質量 226.0 u
STPにおける相 Solid

電子的特性

電気陰性度 0.9

電子配置

配置 [Rn] 7s²

Electron Shell Configuration

Radium electron shell configuration Ra 2e⁻ 8e⁻ 18e⁻ 32e⁻ 18e⁻ 8e⁻ 2e⁻
Electron shell structure of Radium — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 32
5 (O) 18
6 (P) 8
7 (Q) 2

Position in Periodic Table

Radium position in the periodic table Ra

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

Ra を含む反応

Alpha Decay of Radium-226

²²⁶Ra → ²²²Rn + ⁴He

Nuclear

Alpha Decay of Thorium-232

²³²Th → ²²⁸Ra + ⁴He

Nuclear

アルカリ土類金属 をもっと見る

4 Be Beryllium 12 Mg Magnesium 20 Ca Calcium 38 Sr Strontium 56 Ba Barium

Frequently Asked Questions

What is Radium?
Radium (Ra) is a chemical element with atomic number 88. 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 Radium?
Radium has an atomic mass of 226.0 u.
What is the electron configuration of Radium?
The electron configuration of Radium is [Rn] 7s2. It is in the s-block of the periodic table.
What is the electronegativity of Radium?
Radium has an electronegativity of 0.9 on the Pauling scale.