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/ru/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>
Период
7
Группа
1
Блок
s-Блок
Фаза (СТУ)
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.

Физические свойства

Атомная масса 223.0 u
Фаза при СТУ Solid

Электронные свойства

Электроотрицательность 0.7

Электронная конфигурация

Конфигурация [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

Блок и период

Блок

s p d f

Период

1 2 3 4 5 6 7

Периодическая таблица

Лантаниды Актиниды

Больше Щелочной металл

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 щелочной металл.
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.