POLONIUM, Po (84)

Polonium is a rare and highly radioactive element with no stable isotopes, chemically similar to bismuth and tellurium, it occurs in uranium ores with applications including heaters in space probes, antistatic devices, and sources of neutrons and alpha particles.

ELEMENT BRIEF

1898 by Marie Curie, France.

DISCOVERY

From the name of Poland.

ETYMOLOGY

Polonium

ELEMENT

Po

SYMBOL

84

ATOMIC NUMBER

7440-08-6

CAS NUMBER

ELEMENTAL SPECTRUM

Silver

ELEMENTAL COLOUR

-

REFRACTIVE INDEX

-

POISSON RATIO

22.780 cm³

MOLAR VOLUME

94.20M Pa, 929.681'7 Atm

BRINELL HARDNESS

2.25

MOHS HARDNESS

-

VICKERS HARDNESS

-

SPEED OF SOUND

-

BULK MODULUS

-

SHEAR MODULUS

-

YOUNG MODULUS

ALLOTROPES

527.15 K, 254.00 °C

MELTING POINT

1,235.15 K, 962.00 °C

BOILING POINT

-

AUTOMATIC IGNITION

-

FLASHPOINT

-

CRITICAL TEMPERATURE

-

CRITICAL PRESSURE

-

THERMAL CONDUCTIVITY

-

THERMAL EXPANSION

-

SPECIFIC HEAT

13.000 kJ/mol

HEAT FUSION

100.000 kJ/mol

HEAT VAPORISATION

-

HEAT COMBUSTION

-

CURIE POINT

-

NEEL POINT

-

ADIABATIC INDEX

Solid

PHASE

Conductor

ELECTRICAL TYPE

2.30M S/m

CONDUCTIVITY

430.00n Ω.m

RESISTIVITY

-

SUPERCONDUCTING POINT

-

MAGNETIC TYPE

-

MASS SUSCEPTIBILITY

-

MOLAR SUSCEPTIBILITY

-

VOLUME SUSCEPTIBILITY

Metalloid

CLASSIFICATION

209.482'652'5

ATOMIC WEIGHT

-

ATOMIC RADIUS

145 pm

COVALENT RADIUS SINGLE BOND

135 pm

COVALENT RADIUS DOUBLE BOND

129 pm

COVALENT RADIUS TRIPLE BOND

197 pm

VAN DER WAALS RADIUS

[Xe]6s²4f¹⁴5d¹⁰6p⁴

ELECTRON CONFIGURATION

Cubic, Primitive

CRYSTAL STRUCTURE

9.196'00 g/cm³

DENSITY AS SOLID

-

DENSITY AS LIQUID

-

DENSITY AS GAS

Pm_3m

SPACE GROUP NAME

221

SPACE GROUP NUMBER

π/2, π/2 π/2

LATTICE ANGLES

335.9, 335.9 335.9 pm

LATTICE CONSTANTS

6

VALENCE

2

ELECTRONEGATIVITY

135.08 kJ/mol

ELECTRON AFFINITY

IONISATION ENERGY