Element 20 of Periodic table is
Calcium with atomic number 20,
atomic weight 40.078.
Calcium, symbol Ca, has a
Face Centered Cubic structure and Silver color.
Calcium is a alkaline earth metal element.
Trivial name of Calcium is alkaline earth metals*.
Know everything about Calcium Facts, Physical Properties, Chemical
Properties, Electronic configuration, Atomic and Crystal Structure.
Calcium is a chemical element with symbol Ca and atomic number 20. Calcium is a soft gray alkaline earth metal, fifth-most-abundant element by mass in the Earth's crust. The ion Ca2+ is also the fifth-most-abundant dissolved ion in seawater by both molarity and mass, after sodium, chloride, magnesium, and sulfate.
Read key information and facts about element Calcium
Explore our interactive periodic table
Periodic table is arranged by atomic number, number of protons in the nucleus which is same as number of
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
20 to find Calcium 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 Calcium on periodic
table look for cross section of group 2 and period
4 in the modern periodic table.
Interactive Periodic Table to Understand
and Learn Cool Trends
The element Calcium was discovered by Humphry Davy in year
1808 in United Kingdom
derived its name from the Latin calx, meaning 'lime'
The table below shows the abundance of Calcium in Universe, Sun, Meteorites,
Earth's Crust, Oceans and Human Body.
The solid state structure of Calcium is Face Centered Cubic.
The Crystal structure can be described in terms of its unit Cell. The unit Cells repeats itself in
dimensional space to form the structure.
The unit cell is represented in terms of its lattice parameters, which are the lengths of the cell
Lattice Constants (a, b and c)
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.
Calcium atoms have 20 electrons and
the electronic shell structure is [2, 8, 8, 2] with Atomic Term Symbol (Quantum Numbers) 1S0.
Shell Structure of Calcium - Electrons per energy
The ground state electronic configuration of Neutral Calcium atom is
The portion of Calcium 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, electrons in
the outermost shell that determine the chemical properties of the element.
Complete ground state electronic configuration for the Calcium atom, Unabbreviated electronic configuration
1s2 2s2 2p6 3s2 3p6 4s2
Calcium atomic radius is 194 pm, while it's covalent radius is 174 pm.
The electron affinity of Calcium is 2.37 kJ/mol
Refer to table below for Ionization energies of Calcium
Refer to below table for Calcium Physical Properties
Calcium is Conductor of electricity. Refer to
below for the Electrical properties of Calcium
Refer to table below for Thermal properties of Calcium
Isotopes of rhodium. Naturally occurring Calcium has
5 stable isotope -
40Ca, 42Ca, 43Ca, 44Ca, 46Ca.
List of unique identifiers to search the element in various chemical registry databases