87 Fr Francio 223,0 u

Francio

Período
7
Grupo
1
Bloque
s-bloque
Fase (STP)
Solid

El francio es el más inestable de los primeros 101 elementos. Es extremadamente raro en la naturaleza: como mucho hay 30 gramos en la corteza terrestre en cada momento.

Acerca de Francio

Of the first 101 elements, none is more unstable than francium. Its nuclei decay so quickly that no more than about 30 grams are present in the crust at any moment, sustained entirely by the decay of heavier actinides. The element holds atomic number 87 and a relative atomic mass of 223.0, and the single valence electron of its [Rn] 7s1 configuration makes it the heaviest alkali metal in group 1 of period 7. Its Pauling electronegativity of 0.7 is the lowest assigned to any element, a direct consequence of how weakly that outermost s electron is held. Francium is a solid at standard conditions, though bulk samples have never been isolated in a quantity sufficient to examine directly.

Propiedades físicas

Masa atómica 223.0 u
Fase a STP Solid

Propiedades electrónicas

Electronegatividad 0.7

Configuración electrónica

Configuración [Rn] 7s¹

Configuración de capas electrónicas

Configuración de capas electrónicas de Francio Fr 2e⁻ 8e⁻ 18e⁻ 32e⁻ 18e⁻ 8e⁻ 1e⁻
Estructura de capas electrónicas de Francio: electrones por capa.
Capa Electrones
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 32
5 (O) 18
6 (P) 8
7 (Q) 1

Posición en la tabla periódica

Posición de Francio en la tabla periódica Fr

Bloque y período

Bloque

s p d f

Período

1 2 3 4 5 6 7

Tabla Periódica

Lantánidos Actínidos

Más Metal Alcalino

3 Li Litio 11 Na Sodio 19 K Potasio 37 Rb Rubidio 55 Cs Cesio

Frequently Asked Questions

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