33 As 74.922
Arsenic
metalloid
Properties
- Atomic number
- 33
- Atomic mass
- 74.922 u
- Category
- metalloid
- Group
- 15
- Period
- 4
- Block
- p-block
- State (room temp)
- Solid
- Outer-shell electrons
- 5
- Electronegativity
- 2.18 (Pauling)
- Density
- 5.727 g/cm³
- Melting point
- -
- Boiling point
- -
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p³
Noble-gas shorthand: [Ar] 3d¹⁰ 4s² 4p³
Electrons per shell: 2, 8, 18, 5, which is 5 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
About Arsenic
Arsenic is a chemical element with symbol As and atomic number 33. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. Arsenic is a metalloid.
- Discovered by Bronze Age
- Appearance: metallic grey
Arsenic: frequently asked questions
- What is Arsenic?
- Arsenic (As) is the chemical element with atomic number 33. It is a metalloid, with properties between metals and nonmetals.
- What is the atomic number of Arsenic?
- Arsenic's atomic number is 33, which means every Arsenic atom has 33 protons in its nucleus.
- What is the electron configuration of Arsenic?
- The electron configuration of Arsenic is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3 (noble-gas shorthand: [Ar] 3d10 4s2 4p3). Its electrons are arranged in shells of 2, 8, 18, 5, with 5 in the outermost shell.
- Is Arsenic a metal or a nonmetal?
- Arsenic is a metalloid, with properties between metals and nonmetals.
- What group and period is Arsenic in?
- Arsenic is in group 15 and period 4 of the periodic table.
- Is Arsenic a solid, liquid, or gas?
- At room temperature, Arsenic is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.