Protactinium 91

Atomic No. Order:

Alphabetic Order:

Periodic Table

Pr
59

Pa
91

Uqu
141

Ueu
191

Protactinium

Symbol

Atomic Number

Relative Atomic Mass
¹²C = 12.0000

231.03588
3.25(1) x 104 year

Significant Atomic Mass

233
Neutrons 142

Atomic Radius pm

161

First Ionisation Energy
kJ mol ^-1

568

Electronegativity

1.5

Density kg m ^-3

15370 (est.)

Molar Volume cm ³

15.0

Thermal Conductivity
W m ^-1 K ^-1

47 [300 K] (est.)

Melting Point K

2113

Boiling Point K

c. 4300

Number of Isotopes

Inner + outer Shells

Inner + outer Orbitals

???

Algorythm of Software

2, 8, 18, 32,

20, 9, 2

2, 8, 18, 32,

21, 8, 2

Distribution of electrons

	s	p	d	f
1	2
2	2	6
3	2	6	10
4	2	6	10	14
5	2	6	10	2
6	2	6	1
7	2

	s	p	d	f
1	2
2	2	6
3	2	6	10
4	2	6	10	14
5	2	6	10	3
6	2	6
7	2

Filling Orbital

6d ¹

5f ³

Ground State Electron Configuration

[Rn]

5f ²

6d ¹

7s ²

[Rn]

5f ³

6p ⁶ 7s ²

Ground State Electron Configuration with free Orbitals (n=27)

0, 0, 0, 0, 12, 9, 6

0, 0, 0, 0, 11, 10, 6

Ground State Electron Configuration with compressed 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	3	11	18
6	2	6	10	14		18	22
7	2	6	10	14		18	22	26
8

Term Symbol

⁴K _11/2

Discovery

²³⁴Pa was discovered by Kasimir Fajans and O.H. Goehring in 1913. ²³¹Pa was discovered by L. Meitner, O. Hahn (Berlin Germany), K. Fajans (Karlsruhe, Germany), F. Soddy, J.A. Cranston and A. Fleck (Glasgow, Scotland) in 1917

Name Derived From

Greek protos meaning 'first'

APSIDIUM

Created:

2002-08- 15

091.pdf

Page update:

2005-09-10