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.
It belongs to group 15 of the periodic table having trivial name pentels, pnictogens*.
Read key information and facts about element Arsenic
|Group in Periodic Table||15|
|Group Name||nitrogen family|
|Period in Periodic Table||period 4|
|Block in Periodic Table||p -block|
|Electronic Configuration||[Ar] 3d10 4s2 4p3|
|Electronic Shell Structure (Electrons per shell)||2, 8, 18, 5|
|Melting Point||1090 K|
|Boiling Point||887 K|
How to Locate Arsenic on Periodic Table
Periodic table is arranged by atomic number, number of protons in the nucleus which is same as number of electrons. The atomic number increases from left to right. Periodic table starts at top left ( Atomic number 1) and ends at bottom right (atomic number 118). Therefore you can directly look for atomic number 33 to find Arsenic on periodic table.
Another way to read periodic table and locate an element is by using group number (column) and period number (row). To locate Arsenic on periodic table look for cross section of group 15 and period 4 in the modern periodic table.
The element Arsenic was discovered by Arabic alchemist in year ca. 800 AD . Arsenic was first isolated by in . Arsenic derived its name English word (Latin arsenicum).
First isolated by Jabir ibn Hayyan , an Arabian alchemist. Albertus Magnus was the first European to isolate the element.
Arsenic Presence: Abundance in Nature and Around Us
The table below shows the abundance of Arsenic in Universe, Sun, Meteorites, Earth's Crust, Oceans and Human Body.
|ppb by weight (1ppb =10^-7 %)||ppb by atoms (1ppb =10^-7 %)|
|Abundance in Universe||8||0.1|
|Abundance in Sun||-||-|
|Abundance in Meteorites||1800||460|
|Abundance in Earth's Crust||2100||580|
|Abundance in Oceans||2.3||0.19|
|Abundance in Humans||50||4|
Crystal Structure of Arsenic
The solid state structure of Arsenic is Simple Trigonal.
The Crystal structure can be described in terms of its unit Cell. The unit Cells repeats itself in three dimensional space to form the structure.
Unit Cell Parameters
The unit cell is represented in terms of its lattice parameters, which are the lengths of the cell edges Lattice Constants (a, b and c)
|375.98 pm||375.98 pm||1054.75 pm|
and the angles between them Lattice Angles (alpha, beta and gamma).
The positions of the atoms inside the unit cell are described by the set of atomic positions ( xi, yi, zi) measured from a reference lattice point.
The symmetry properties of the crystal are described by the concept of space groups. All possible symmetric arrangements of particles in three-dimensional space are described by the 230 space groups (219 distinct types, or 230 if chiral copies are considered distinct.
|Space Group Name||R_ 3m|
|Space Group Number||166|
|Crystal Structure||Simple Trigonal|
|Number of atoms per unit cell|
The number of atoms per unit cell in a simple cubic, face-centered cubic and body-centred cubic are 1,4,2 respectively.
Arsenic Atomic and Orbital Properties
Arsenic atoms have 33 electrons and the electronic shell structure is [2, 8, 18, 5] with Atomic Term Symbol (Quantum Numbers) 4S3/2.
|Number of Electrons (with no charge)||33|
|Number of Protons||33|
|Number of Neutrons||42|
|Shell structure (Electrons per energy level)||2, 8, 18, 5|
|Electron Configuration||[Ar] 3d10 4s2 4p3|
|Valence Electrons||4s2 4p3|
|Main Oxidation States||-3, 3, 5|
|Oxidation States||-3, -2, -1, 0, 1, 2, 3, 4, 5|
|Atomic Term Symbol (Quantum Numbers)||4S3/2|
Bohr Atomic Model of Arsenic - Electrons per energy level
Ground State Electronic Configuration of Arsenic - neutral Arsenic atom
Abbreviated electronic configuration of Arsenic
The ground state abbreviated electronic configuration of Neutral Arsenic atom is [Ar] 3d10 4s2 4p3. The portion of Arsenic configuration that is equivalent to the noble gas of the preceding period, is abbreviated as [Ar]. For atoms with many electrons, this notation can become lengthy and so an abbreviated notation is used. This is important as it is the Valence electrons 4s2 4p3, electrons in the outermost shell that determine the chemical properties of the element.
Unabbreviated electronic configuration of neutral Arsenic
Complete ground state electronic configuration for the Arsenic atom, Unabbreviated electronic configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p3
Electrons are filled in atomic orbitals as per the order determined by the Aufbau principle, Pauli Exclusion Principle and Hund’s Rule.
Atomic Structure of Arsenic
Arsenic atomic radius is 114 pm, while it's covalent radius is 119 pm.
|Atomic Radius Calculated|
114 pm (1.14 Å)
|Atomic Radius Empirical|
115 pm (1.15 Å)
|Atomic Volume||12.95 cm3/mol|
|Covalent Radius||119 pm (1.19 Å)|
|Van der Waals Radius||185 pm|
|Neutron Cross Section||4.3|
|Neutron Mass Absorption||0.002|
Atomic Spectrum of Arsenic
Arsenic Chemical Properties: Arsenic Ionization Energies and electron affinity
The electron affinity of Arsenic is 78 kJ/mol.
Ionization Energy of Arsenic
Refer to table below for Ionization energies of Arsenic
|Ionization energy number||Enthalpy - kJ/mol|
Arsenic Physical Properties
Refer to below table for Arsenic Physical Properties
|Density||5.727 g/cm3(when liquid at m.p density is $5.22 g/cm3)|
|Molar Volume||12.95 cm3/mol|
|Bulk Modulus||22 GPa|
Hardness of Arsenic - Tests to Measure of Hardness of Element
|Mohs Hardness||3.5 MPa|
|Brinell Hardness||1440 MPa|
Arsenic Electrical Properties
Arsenic is Conductor of electricity. Refer to table below for the Electrical properties ofArsenic
|Electrical Conductivity||3300000 S/m|
|Resistivity||3e-7 m Ω|
Arsenic Heat and Conduction Properties
|Thermal Conductivity||50 W/(m K)|
Arsenic Magnetic Properties
|Mass Magnetic Susceptibility||-3.9e-9 m3/kg|
|Molar Magnetic Susceptibility||-2.92e-10 m3/mol|
|Volume Magnetic Susceptibility||-0.0000223|
Optical Properties of Arsenic
Acoustic Properties of Arsenic
|Speed of Sound||-|
Arsenic Thermal Properties - Enthalpies and thermodynamics
Refer to table below for Thermal properties of Arsenic
|Melting Point||1090 K (816.85°C, 1502.3300000000002 °F)|
|Boiling Point||887 K (613.85°C, 1136.93 °F)|
Enthalpies of Arsenic
|Heat of Fusion||27.7 kJ/mol|
|Heat of Vaporization||32.4 kJ/mol|
|Heat of Combustion||-|
Arsenic Isotopes - Nuclear Properties of Arsenic
Arsenic has 33 isotopes, with between 60 and 92 nucleons. Arsenic has 1 stable naturally occuring isotopes.
Isotopes of Arsenic - Naturally occurring stable Isotopes: 75As.
|Isotope||Z||N||Isotope Mass||% Abundance||T half||Decay Mode|
Compare Arsenic with other elements
Compare Arsenic with all Group 15 elements
Compare Arsenic with all Period 4 elements
Compare Arsenic with all Metalloid elements
What is the electronic configuration of Arsenic?
The electronic configuration of Arsenic is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p3.
What is the abbreviated electronic configuration of Arsenic?
The abbreviated electronic configuration of Arsenic is [Ar] 3d10 4s2 4p3. To form abbreviated notation of electronic configuration, the completely filled subshells are replaced by the noble gas of the preceding period in square brackets.
What is the symbol of Arsenic?
Symbol of Arsenic is As. Arsenic is a chemical element with symbol As and atomic number 33.
What is the position of Arsenic in the Periodic Table?
Arsenic is a chemical element with the symbol As and atomic number 33. Arsenic is the 33 element on the periodic table. It is located in group 15 and period 4 in the modern periodic table.
What is the atomic number of Arsenic?
The atomic number of Arsenic is 33.
What is the color of Arsenic?
Arsenic is of Silver color.
Who discovered Arsenic?
The element Arsenic was discovered by Arabic alchemist in year ca. 800 AD . Arsenic was first isolated by in .
How many valence electrons does a Arsenic atom have?
Arsenic has 5 valence electrons. Arsenic has 33 electrons out of which 5 valence electrons are present in the 4s2 4p3 outer orbitals of atom.
What is the melting Point of Arsenic?
Melting Point of Arsenic is 1090 K.
What is the boiling Point of Arsenic?
Boiling Point of Arsenic is 887 K.
What is the melting Point of Arsenic in Kelvin?
Melting Point of Arsenic in Kelvin is 1090 K.
What is the boiling Point of Arsenic in Kelvin?
Boiling Point of Arsenic in Kelvin is 887 K.
What is the electronic configuration of Arsenic 33?
The electronic configuration of Arsenic will be 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p3.
How do you write the electron configuration for Arsenic?
The electronic configuration of Arsenic will be 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p3.