33 · As
Arsenic
A metallic isolation is attributed to Albertus Magnus around 1250. The year is approximate and the tradition is not laboratory proof.
Identity
- Atomic number
- 33
- Symbol
- As
- Canonical name
- Arsenic
- Category
- metalloid
- Group
- 15
- Period
- 4
- Block
- p
Properties
These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.
- Atomic mass
- 74.921596 u
- Electron configuration
- [Ar] 3d10 4s2 4p3
- Electrons per shell
- 2, 8, 18, 5
- Standard state
- solid
- Density
- 5.727 g/cm³
- Electronegativity
- 2.18 Pauling
- First ionization energy
- 947 kJ/mol
- Electron affinity
- 77.65 kJ/mol
Notable isotopes
This summary is not an inventory of every isotope.
- As-75 · 100 % · stable
History
Isolation attributed to Albertus Magnus
Isolation · claimed · about 1250
Tradition attributes metallic arsenic to Albertus Magnus around the mid-thirteenth century. The year is approximate and the claim has no modern laboratory notebook.
Etymology
- Theme
- mineral
- Language
- grec
- Root
- arsenikon
- Meaning
- yellow orpiment
Scientists
Places and institutions
- Cologne — historical setting : Holy Roman Empire — present country : Germany Traditional setting of Albertus Magnus’s work.
See also
Sources
- IUPAC, Periodic Table of the Elements
- Bowserinator, Periodic Table JSON. Compilation secondaire d’où viennent les grandeurs physiques importées (masse, densité, températures, énergies). Elles ne sont pas revérifiées une à une auprès du NIST ou de la CIAAW.
- John Emsley, Nature’s Building Blocks: An A–Z Guide to the Elements