Arsenic 33

Atomic No. Order:

Alphabetic Order:

Periodic Table

2, 8, 18,

N
7

P
15

As
33

Sb
51

Bi
83

Uup
115

Uhp
165

Bup
215

Arsenic

Symbol

Atomic Number

Relative Atomic Mass
¹²C = 12.0000

74.921 60 (±2) [Since 1995]

Atomic Radius pm

121

First Ionisation Energy
kJ mol ^-1

947.0

Ionisation Energy (eV)

9.7886

Electronegativity

2.18

Density
kg m ^-3

5780 (±)
4700 (²) [293 K]

Molar Volume
cm ³

12.95 (±)
15.9 (²)

Thermal Conductivity
W m ^-1 K ^-1

50.0 (±) [300 K]

Melting Point K

1090 (±, under pressure)

Boiling Point K

889 (sublimes)

Number of Isotopes

Isotope Atomic mass/u Mole fraction

75As 74.921 5966(18) 1.0000

Inner + outer Shells

Inner + outer Orbitals

Filling Orbital

4p ³

Ground State Electron
Configuration

[Ar]

3d ¹⁰

4s ²

4p ³

Ground State Electron
Configuration with
free Orbitals (n=3)

0, 0, 0, 3

Ground State Electron
Configuration with
compressed Orbitals (n=24)

0, 0, 0, 24

Singularity

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

Term Symbol

⁴S _3/2

Discovery

The German scientist and philosopher, Albert von Bollstadt [1193 - 1280] (Albert the Great/ Albertus Magnus ) is thought to have obtained the metal around 1250.

Name Derived From

The name derives from the Latin arsenicium and the Greek arsenikos for "masculine or male" because the ancients thought that metals were different sexes. It was known in prehistoric times for its poisonous sulfides. Greek arsenikon meaning 'yellow orpiment'

APSIDIUM ©	Created:		2002-06-01		033.pdf
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