フランシウム
87
Fr
族
1
周期
7
ブロック
s
陽子
電子
中性子
87
87
136
一般特性
原子番号
87
原子量
[223]
質量数
223
カテゴリ
アルカリ金属
色
銀色
放射性
はい
Francium was named after France
結晶構造
該当なし
歴史
Francium was discovered in 1939 by Marguerite Perey of the Curie Institute in Paris, France.
It was discovered when she was researching the radioactive decay of actinium-227.
Marguerite Perey discovered that francium-223 is made naturally when actinium-227 emits an alpha-particle.
It was discovered when she was researching the radioactive decay of actinium-227.
Marguerite Perey discovered that francium-223 is made naturally when actinium-227 emits an alpha-particle.
電子殻
2, 8, 18, 32, 18, 8, 1
電子配置
[Rn] 7s1
Francium was the last element discovered in nature, rather than by synthesis
物理特性
相
固体
密度
1.87 g/㎝3
融点
296.15 K | 23 °C | 73.4 °F
沸点
950.15 K | 677 °C | 1250.6 °F
融解熱
2 kJ/mol
蒸発熱
65 kJ/mol
熱容量
-
地殻中における存在比
該当なし
宇宙空間における存在比
該当なし
CAS登録番号
7440-73-5
PubChem CID番号
該当なし
原子特性
原子半径
260 pm
共有結合半径
348 pm
電気陰性度
0.7 (ポーリングの値)
イオン化エネルギー
4.0727 eV
モル体積
71.07 ㎝3/mol
熱伝導率
0.15 W/㎝·K
酸化数
1
用途
Due to its instability and rarity, there are no commercial applications for francium.
It has been used for research purposes in the fields of biology and of atomic structure.
Its use as a potential diagnostic aid for various cancers has also been explored, but this application has been deemed impractical.
It has been used for research purposes in the fields of biology and of atomic structure.
Its use as a potential diagnostic aid for various cancers has also been explored, but this application has been deemed impractical.
Francium is highly radioactive
同位体
安定同位体
-不安定同位体
199Fr, 200Fr, 201Fr, 202Fr, 203Fr, 204Fr, 205Fr, 206Fr, 207Fr, 208Fr, 209Fr, 210Fr, 211Fr, 212Fr, 213Fr, 214Fr, 215Fr, 216Fr, 217Fr, 218Fr, 219Fr, 220Fr, 221Fr, 222Fr, 223Fr, 224Fr, 225Fr, 226Fr, 227Fr, 228Fr, 229Fr, 230Fr, 231Fr, 232Fr