Francium 87

Atomic No. Order:

Alphabetic Order:

Periodic Table

2, 8, 18, 32,

18, 8, 1

H
1

Li
3

Na
11

K
19

Rb
37

Cs
55

Fr
87

Uue
119

Uhe
169

Bue
219

Francium

Symbol

Fr
alkali metal

Atomic Number

Relative Atomic Mass
¹²C = 12.0000

[ 223 ]
223.0197
22.0(1) min.

Significant Atomic Mass

224
Neutrons 137

Atomic Radius pm

ca. 270 < 291 >

First Ionisation Energy
kJ mol ^-1

400 < 341 >

Ionization energy (eV)

4,7270

Electronegativity

0.7 < 0.75 >

Density kg m ^-3

< 2461 >

Molar Volume cm ³

< 84.83 cm ³/mol>

Thermal Conductivity
W m ^-1 K ^-1

15 [300 K] (est.) < 22.9 >

Melting Point K

300 < 301 >

Boiling Point K

950 < 945.6 >

Number of Isotopes

Inner/outer Shells

Inner/outer Orbitals

Filling Orbital

7s ¹

Ground State Electron
Configuration

[Rn]

5d ¹⁰ 6p ⁶

7s ¹

Ground State Electron
Configuration with
free Orbital (n= 31)

0, 0, 0, 0, 14, 10, 7

Ground State Electron
Configuration with
compr. Orbitals (n= 162)

0, 0, 0, 0, 18, 54, 90

Singularity

280

162

	s		p	d	f	g	h	i	j
1	2
2	2		6
3	2		6	10
4	2		6	10	14
5	2		6	10	14	18
6	2		6	10	14	18	22
7	1	1	6	10	14	18	22	26
8

Term Symbol

²S _1/2

Discovery

Discovered by M. Perey (Paris, France) in 1939

Name Derived From

Named after France

APSIDIUM	Created:	2002-08-13	087.pdf
	Page update:	2007-05-21	087.pdf

< > prediction of Herman Rosenfeld