87 Fr Francium 223.0 u

Francium

Add one script tag to your page:

<div data-chemfyi="element" data-slug="Fr"></div>
<script src="https://cdn.jsdelivr.net/npm/chemfyi-embed@1/dist/embed.min.js" defer></script>

Embed as an iframe:

<iframe src="https://chemfyi.com/iframe/element/Fr/?style=modern&theme=light" width="420" height="400" frameborder="0" loading="lazy" style="border:0;border-radius:10px;max-width:100%"></iframe>

Paste the URL in WordPress, Medium, or Ghost:

https://chemfyi.com/zh-hans/element/fr/

Shields.io-compatible SVG badge:

Francium badge ![Francium](https://chemfyi.com/badge/element/Fr.svg)

Web Component:

<chemfyi-element slug="Fr"></chemfyi-element>
<script src="https://cdn.jsdelivr.net/npm/chemfyi-embed@1/dist/embed.min.js" defer></script>
周期
7
族
1
区块
s-区块
相态 (STP)
Solid

Francium is the most unstable of the first 101 elements. It is extremely rare in nature, with at most 30 grams in Earth's crust at any time.

物理属性

原子质量 223.0 u
STP相态 Solid

电子属性

电负性 0.7

电子构型

构型 [Rn] 7s¹

Electron Shell Configuration

Francium electron shell configuration Fr 2e⁻ 8e⁻ 18e⁻ 32e⁻ 18e⁻ 8e⁻ 1e⁻

Position in Periodic Table

Francium position in the periodic table Fr

区块与周期

区块

s p d f

周期

1 2 3 4 5 6 7

元素周期表

镧系元素 锕系元素

更多碱金属

3 Li Lithium 11 Na Sodium 19 K Potassium 37 Rb Rubidium 55 Cs Cesium

Frequently Asked Questions

What is Francium?
Francium (Fr) is a chemical element with atomic number 87. It is a solid at standard temperature and pressure, classified as a 碱金属.
What are the key properties of Francium?
Francium has an atomic mass of 223.0 u.
What is the electron configuration of Francium?
The electron configuration of Francium is [Rn] 7s1. It is in the s-block of the periodic table.
What is the electronegativity of Francium?
Francium has an electronegativity of 0.7 on the Pauling scale.