Francium

Chemicool

Fr	87
(223)
Francium

General | States | Energies | Oxidation & Electrons |Appearance & Characteristics

Reactions | Other Forms |Radius | Conductivity | Abundance

Encyclopedia Britannica articles

General

Name	Francium	Symbol	Fr
atomic number	87	Atomic weight	(223)
Density @ 293 K	?	Atomic volume	?
Group	Alkali Met.	discovered	1939

States

state (s, l, g)	s
melting point	300.2 K	boiling point	K
Heat of fusion	?	Heat of vaporization	?

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Energies

1st ionization energy	384 kJ/mole	electronegativity	0.7
2nd ionization energy	kJ/mole	electron affinity	kJ/mole
3rd ionization energy	kJ/mole	Specific heat	?
heat atomization	73 kJ/mole atoms

Oxidation & Electrons

Shells	2,8,18,32,18,8,1	electron configuration	[Rn] 7s1
minimum oxidation number	0	maximum oxidation number	1
min. common oxidation no.	0	max. common oxidation no.	1

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Appearance & Characteristics

structure		color
uses		toxicity
hardness	mohs	characteristics	Radioactive

Reactions

reaction with air		reaction with 6M HCl	vigorous, = H2, FrCl
reaction with 6M HCl	vigorous, = H2, FrCl	reaction with 15M HNO3
reaction with 6M NaOH	vigorous, = H2, FrOH

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Other Forms

number of isotopes	1	hydride(s)
oxide(s)		chloride(s)

Radius

ionic radius (2- ion)	pm	ionic radius (1- ion)	pm
atomic radius	pm	ionic radius (1+ ion)	194 pm
ionic radius (2+ ion)	pm	ionic radius (3+ ion)	pm

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Conductivity

thermal conductivity	J/m-sec-deg	electrical conductivity	1/mohm-cm
polarizability	48.7 A^3

Abundance

source	Synthetic(U-235 decay)	rel. abund. solar system	log
abundance earth's crust	log	cost, pure	$/100g
cost, bulk	$/100g

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