Cerium 58

Atomic No. Order:

Alphabetic Order:

Periodic Table

Ce
58

Th
90

Ubb
122

Usb
172

Bbb
222

Cerium Truss Element

Symbol

Atomic Number

Relative Atomic Mass
¹²C = 12.0000

140.116 (1) [Since 1995]

Atomic Radius pm

182.5

First Ionisation Energy
kJ mol ^-1

527.4

Electronegativity

1.12

Density
kg m ^-3

8240 (±)
6749 (²)
6773 (³)
6700 (´) [298 K]

Molar Volume cm ³

17.00

Thermal Conductivity
W m ^-1 K ^-1

11.4 [300 K]

Melting Point K

1072

Boiling Point K

3699

Number of Isotopes

Isotope Atomic mass/u Mole fraction

136Ce 135.907 140(50) 0.001 85(2)
138Ce 137.905 986(11) 0.002 51(2)
140Ce 139.905 435(3) 0.884 50(51)
142Ce 141.909 241(4) 0.111 14(51)

Inner/outer Shells

Inner/outer Orbitals

???

Algorythm of Software

2, 8, 18,

19, 9, 2

2, 8, 18,

20, 8, 2

Distribution of electrons

	s	p	d	f
1	2
2	2	6
3	2	6	10
4	2	6	10	1
5	2	6	1
6	2
7

	s	p	d	f
1	2
2	2	6
3	2	6	10
4	2	6	10	2
5	2	6
6	2
7

Filling Orbital

5d ¹

4f ²

Ground State Electron Configuration

[Xe]

4f ¹

5d ¹

6s ²

[Xe]

4f ²

5p ⁶

6s ²

Ground State Electron Configuration wi th free Orbitals (n=28)

0, 0, 0, 13, 9, 6

0, 0, 0, 12, 10, 6

Ground State Electron Configuration with compressed Orbitals (n=96)

0, 0, 0, 0, 32, 64

Singularity

182

	s	p	d	f		g	h	i	j
1	2
2	2	6
3	2	6	10
4	2	6	10	2	12
5	2	6	10	14		18
6	2	6	10	14		18	22
7
8

Term Symbol

³H ₄

Name Derived From and
Discovery

The name derives from the planetoid Ceres, which was discovered by the Italian astronomer Giuseppe Piazzi in 1801 and named for Ceres, the Roman goddess of agriculture and harvest. Two years later, the element was discovered by the German chemist Martin-Heinrich Klaproth, who called it ochroeite earth because of its yellow color. It was independently discovered at the same time by the Swedish chemist Jöns Jacob Bezelius and the Swedish mineralogist Wilhelm von Hisinger, who called it ceria. It was first isolated in 1875 by the American mineralogist and chemist William Frances Hillebrand and the American chemist Thomas H. Norton (Washington D.C., USA).

APSIDIUM ©	Created:		2002-07-21		058.pdf
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