Reactivity & Chemical Bonding
Chemical Behavior & Oxidation States
Calcium exhibits chemical reactivity characteristic of the alkaline earth family, governed by an electronegativity of 1 and standard valence interactions.
Z = 20Alkaline Earth Metal
Launch 3D Atom & Orbitals LabCalcium
Ca
Standard Atomic Mass: 40.078 u
Period 4Group 2S-Block
Chemical Specimen/Ca
Concentric Electron Shells4 Energy Levels
n=1: 2e⁻→
n=2: 8e⁻→
n=3: 8e⁻→
n=4: 2e⁻
Scientific Monograph • Alkaline Earth Metal
3D Atom SimulatorCalcium (Ca) Scientific Profile
Calcium (Ca) is an element with atomic number 20, classified as a alkaline earth. Positioned in Period 4, Group 2, and S-block, its chemical and physical profile is defined by its electron configuration ([Ar]4s²) and periodic trends.
Interactive Virtual Labs Available for Calcium
3D Orbitals & Valence Lab
Simulate concentric quantum energy levels, observe valence electron spins, and examine live atomic clouds in full 3D.
Electronic Configuration Lab
Experiment with Aufbau subshell ordering, explore orbital occupancy, and analyze quantum configuration exceptions.
Electron Config
[Ar]4s²
Electronegativity
1 Pauling
Year Discovered
1808
Orbital Shells
4 Principal Levels
Orbital Block
s-block orbital
Group / Period
G: 2 • P: 4
Technological Utility
Industrial & Energy Applications
Calcium is utilized in industrial fabrication, materials engineering, electronic manufacturing, and advanced laboratory research based on its specific thermodynamic properties.
Biological Role
Biomedical Profile & Toxicity
Calcium does not play a prominent biological role in human biochemistry, existing primarily as a trace element or mineral component in natural ecosystems.
Geochemistry & Abundance
Cosmic & Terrestrial Occurrence
Elements like Calcium are synthesized through stellar nucleosynthesis and supernovae r-processes. On Earth, Calcium is concentrated in specific ore deposits or synthesized in nuclear accelerators.
Frequently Asked Questions about Calcium
Q
What are the key physical and atomic properties of Calcium?
Calcium (Ca) has an atomic number of 20 and a standard atomic mass of 40.078 u. It is positioned in Period 4, Group 2, in the S-block, and is classified within the Alkaline Earth Metal category.
Q
What is the electron configuration of Calcium?
The ground-state electron configuration of Calcium is [Ar]4s². Its 20 electrons are distributed across 4 principal energy levels (2, 8, 8, 2).
Q
Why does Calcium exhibit an electron configuration exception?
Calcium follows standard Aufbau principle orbital filling. Transition metals and heavy elements optimize their shell filling based on subshell exchange energy and electrostatic stability.
Q
What are the primary commercial and laboratory uses of Calcium?
Calcium is utilized in industrial fabrication, materials engineering, electronic manufacturing, and advanced laboratory research based on its specific thermodynamic properties.