Tellurium 52

Atomic No. Order:

Alphabetic Order:

Periodic Table

2, 8, 18,

18, 6

O
8

S
16

Se
34

Te
52

Po
84

Uuh
116

Uhh
166

Buh
216

Tellurium

Symbol

Atomic Number

Relative Atomic Mass
¹²C = 12.0000

127.60 (3) [Since 1969]

Atomic Radius pm

143

First Ionisation Energy
kJ mol ^-1

869.2

Ionization energy (eV)

9,9600

Electronegativity

2.1

Density
kg m ^-3

6240 [293 K]
5797 [l., m.p.]

Molar Volume cm ³

20.45

Thermal Conductivity
W m ^-1 K ^-1

2.35 [300 K]

Melting Point K

722.7

Boiling Point K

1263.0

Number of Isotopes

Isotope Atomic mass/u Mole fraction

120Te 119.904 026(11) 0.0009(1)
122Te 121.903 0558(29) 0.0255(12)
123Te 122.904 2711(20) 0.0089(3)
124Te 123.902 8188(16) 0.0474(14)
125Te 124.904 4241(20) 0.0707(15)
126Te 125.903 3049(20) 0.1884(25)
128Te 127.904 4615(19) 0.3174(8)
130Te 129.906 2229(21) 0.3408(62)

Inner + outer Shells

Inner + outer Orbitals

Filling Orbital

5p ⁴

Ground State Electron
Configuration

[Kr]

4d ¹⁰

5s ²

5p ⁴

Ground State Electron
Configuration with
free Orbitals (n=2)

0, 0, 0, 0, 2

Ground State Electron
Configuration with
compressed Orbitals (n=56)

0, 0, 0, 14, 42

Singularity

110

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

Term Symbol

³P₂

Name Derived From and
Discovery

The name derives from the Latin Tellus, who was the Roman goddess of the earth.

t was discovered by the Roumanian mine director Franz Joseph Müller von Reichenstein (Sibiu, Romania) in 1782 and overlooked for 15 years until it was isolated by the German chemist Martin-Heinrich Klaproth in 1798. The Hungarian chemist Paul Kitaibel independently discovered tellurium in 1789, prior to Klaproth's work but after von Reichenstein.

APSIDIUM ©	Created:		2002-07-20		052.pdf
	Page update:		2004-06-20		052.pdf