Atomic Number of Arsenic

Arsenic Atomic Number

Atomic Number of Arsenic is 33.

Chemical symbol for Arsenic is As. Number of protons in Arsenic is 33. Atomic weight of Arsenic is 74.921595 u or g/mol. Melting point of Arsenic is 613 °C and its the boiling point is 613 (Subl.) °C.

» Boiling Point » Melting Point » Abundant » State at STP » Discovery Year

About Arsenic

Arsenic is a semi-metal and a chemical element known since the old times. It has got its name after the Greek word for orpiment. In very small amounts it can be found on the surface of earth, but generally it is obtained from minerals like arsenopyrite and others. It micro doses, arsenic is essential to all living things, but it is carcinogenic even in very low doses. This element can be found in some seafood like prawns. Some compounds of arsenic have very strong poisonous properties, and they are used as poison for rodents and insects. This chemical element has applications in medicine, mainly for its great toning properties. Arsenic also plays a role of semiconductor doping agent and is used in pyrotechnics, producing solid-state devices, and so on.

Uses of Arsenic

Arsenic, a silver-grey, semi-metal element with the symbol As, is used in semiconductors. And mostly used in alloying with lead. It can be employed with silicon and germanium. Elemental arsenic is mainly used in bronzing and pyrotechnics. Arsenious oxide, also known as white arsenic, is used in the manufacture of glass. Arsenic trioxide is employed as a precursor to forestry products as well as in electronics, paints and making glass. Arsenic compounds are used as wood preservatives. They also can be used in some medical applications and in agriculture too. Besides, they are preferred for military purposes. Arsine, an odorless, colorless, poisonous gas with the formula AsH3, employed as a doping agent for semiconductors.

Compounds with Arsenic

Properties of Arsenic Element

Atomic Number (Z)33
Atomic SymbolAs
Atomic Weight74.921595 u
Density5.776 g/cm3
Melting Point (K)1090 K
Melting Point (℃)613 °C
Boiling Point (K)887 K
Boiling Point (℃)613 (Subl.) °C
Heat Capacity0.329 J/g · K
Abundance1.8 mg/kg
State at STPSolid
Electronegativity (Pauling) χ2.18
Ionization Energy (eV)9.7886
Atomic Radius115pm
Covalent Radius119pm
Van der Waals Radius185
Valence Electrons5
Year of Discoveryca. 1250
DiscovererAlbertus Magnus

What is the Boiling Point of Arsenic?

Arsenic boiling point is 613 (Subl.) °C. Boiling point of Arsenic in Kelvin is 887 K.

What is the Melting Point of Arsenic?

Arsenic melting point is 613 °C. Melting point of Arsenic in Kelvin is 1090 K.

How Abundant is Arsenic?

Abundant value of Arsenic is 1.8 mg/kg.

What is the State of Arsenic at Standard Temperature and Pressure (STP)?

State of Arsenic is Solid at standard temperature and pressure at 0℃ and one atmosphere pressure.

When was Arsenic Discovered?

Arsenic was discovered in ca. 1250.