Calcium ion Lewis Structure

Calcium ion Lewis Structure: Ca+₂ Lewis Structure, see text Geometry, sp3 Hybridization & Polarity

Calcium ion Key Facts

The Calcium ion Lewis structure is central Ca bonded; the central Ca has 0 electron domains (0 lone pairs), giving a tetrahedral electron-domain arrangement and a see text molecular geometry with a — bond angle. Ca is best described as sp3-hybridized, and Calcium ion is polar because the see text shape (and/or unequal terminal atoms) prevents cancellation of the bond dipoles.

Figure 1: Lewis Structure of Calcium ion (Ca+₂)

Chemical Formula	Ca+₂
CAS Number	14127-61-8
Net Charge	+2
Total Valence Electrons	0
Lewis Structure	central Ca bonded
Electron-Domain Geometry	tetrahedral
Molecular Geometry	see text
Hybridization Model	sp3 (central Ca)
Bond Angle	—
Polarity	Polar molecule

PubChem (CID 271) and NIST list Calcium ion as Ca+ ₂ with CAS 14127-61-8; molecular weight ≈ 40.08 g/mol. View CAS 14127-61-8 dictionary details on Guidechem →

Applications of Calcium ion (CAS 14127-61-8)

In aqueous and process chemistry, Ca+₂ exists as the cation Calcium ion ion. It is encountered as a counterion and a controlled source of Ca in salts, buffers, electrochemistry and analytical protocols, and as a reactant in syntheses that require a defined equivalent of Ca-containing material.

Ion Source / Counterion Supplied as salts and solutions; specify hydration, counter-cation and concentration.

Analytical & Electrochemical Used in titrations, plating baths and ionic-strength control where the ion is the active species.

Synthesis Reagent A controlled source of Ca in precipitation, complexation and redox procedures.

Procurement Note "Calcium ion" is supplied in multiple commercial grades and package sizes. Specify purity, grade, moisture/impurity limits, package (cylinder, drum or bulk) and intended process, and use CAS 14127-61-8 as the primary identifier when screening suppliers; always confirm regional availability and safety documentation (SDS).

Step 1 - Valence Electrons & Central Atom

To draw the Calcium ion Lewis structure we first count the total valence electrons. Ca+₂ contains 2 (Ca) + 2 (net cation); the net charge of +2 gives a total of 0 valence electrons to place.

The central atom is Ca. It is the least electronegative atom capable of forming multiple bonds and is surrounded by the more electronegative terminal atom(s); hydrogen, when present, always occupies a terminal position. Electronegativity considerations place the electron density toward the terminal atom(s).

Valence-electron count

Total valence electrons = 2 (Ca) + 2 (net cation) = 0 electrons.

Step 2 - Lewis Structure & Electron Distribution

Place Ca at the center and connect each surrounding atom with a single bond, complete octets on the terminal atoms, and place any remaining electrons on the central atom. The resulting electron distribution is: central Ca bonded; no lone pairs on Ca.

Counting bonding and nonbonding electrons around Ca therefore satisfies the octet/expanded-octet requirement for the drawn structure.

Ca: 0 lone pairs, 0 bonding domains

0 bonding domains + 0 lone pairs = 0 electron domains

Octet Rule: Why Ca Has Eight Electrons Ca forms 0 bond(s) and retains 0 nonbonding electron(s), reaching an octet. No expanded octet is required for this second-row (or octet-satisfying) central atom.

Step 3 - VSEPR Theory & Geometry

VSEPR theory states that the 0 electron domains around Ca arrange to minimize mutual repulsion, giving an tetrahedral electron-domain geometry.

Because 0 of these domains are lone pair(s) — and lone pairs repel more strongly than bonding pairs — the observed molecular geometry is see text; the Ca bond angle is set to — rather than the ideal value for the electron-domain geometry.

Repulsion hierarchy

A useful VSEPR approximation is: lone pair–lone pair repulsion > lone pair–bonding pair repulsion > bonding pair–bonding pair repulsion. With 0 lone pair(s) on Ca, the lone-pair domains occupy positions that minimize overall repulsion while pushing the bonding domains (and therefore the bonded atoms) closer together.

Hybridization & Formal Charge

In the conventional localized-bond model, Ca uses sp3 hybrid orbitals to form the 0 equivalent electron-domain directions (0 bonding + 0 lone pair).

Formal-charge check

Formal charge on central Ca = V − N − ½B = 2 − 0 − ½×0 = 2. The nonzero formal charge is distributed by resonance / charge separation; the drawn structure is the lowest-energy contributor.

Modeling Note Modeling Note: sp3 is a compact model for the 0 electron-domain directions around Ca; full quantum-chemical treatments use molecular orbitals.

Is Calcium ion Polar or Nonpolar?

Calcium ion is polar. The see text shape prevents cancellation of the bond dipoles. The bond dipoles do not cancel, leaving a net molecular dipole, which strongly influences solvation behavior and intermolecular interactions.

Expert Quote — Structural Chemistry Perspective

The decisive structural fact is not simply that the individual bonds are polar; it is whether molecular symmetry allows their vector sum to vanish. In Calcium ion the see text arrangement prevents cancellation, so a permanent dipole remains.

Interpretation consistent with standard VSEPR / molecular-geometry references.

This polarity profile underpins its behavior as a solvent, reactant or process intermediate; when sourcing, specify grade and container compatibility.

Structural Comparison Table

Species	Formula	Central Atom	Electron Domains	Molecular Geometry	Polarity
Calcium ion	Ca+₂	Ca	0	see text	Polar
Carbon dioxide	CO₂	C	2	linear	Nonpolar
Carbon monoxide	CO	C	2	linear (diatomic)	Polar
Carbon disulfide	CS₂	C	2	linear	Nonpolar

Practice question Starting from the 0 valence electrons of Ca+₂, draw the Lewis structure and confirm the central Ca atom is sp3-hybridized with see text geometry. What happens to the bond angle if one terminal atom is replaced by a more electronegative substituent?

Looking for industrial bulk or specified-grade supplies of Calcium ion (CAS 14127-61-8)? Browse Supplier on Guidechem →

FAQs

Is Ca+₂ polar or nonpolar?

Calcium ion is polar. Its see text geometry (and/or unequal terminal atoms) stops the bond dipoles from cancelling.

What is the Lewis structure of Calcium ion?

central Ca bonded; no lone pairs on Ca. It uses all 0 valence electrons and the preferred structure carries a formal charge of 2 on the central atom.

What is the bond angle in Calcium ion?

The Ca angle is about —. Lone-pair repulsion compresses the angle from the ideal tetrahedral value.

What is the hybridization of Ca in Calcium ion?

The conventional model is sp3. Calcium ion has 0 electron domains around the central Ca.

What is the CAS number of Calcium ion?

The CAS number is 14127-61-8. PubChem (CID 271) and NIST identify this with Ca+₂; use it to locate suppliers and database records.

References

PubChem CID 271, Calcium ion. Molecular formula, CAS number, molecular weight and chemical identity.
NIST Chemistry WebBook, SRD 69, Calcium ion. Formula, CAS Registry Number and thermochemical / spectroscopic data.
IUPAC Gold Book. Definitions for "lone pair", "VSEPR", "hybridization" and "formal charge".
Atkins, P. & de Paula, J., Physical Chemistry. VSEPR, molecular geometry and dipole moments.
Guidechem supplier & dictionary records. Commercial sourcing and CAS-linked property pages for Calcium ion (CAS 14127-61-8).

Technical scope: Lewis structures, VSEPR and hybridization are model-based descriptions for chemical communication and structure prediction; actual molecular electronic structure is more accurately represented by molecular-orbital and quantum-chemical methods. Commercial grades vary substantially by supplier and intended use; CAS 14127-61-8 identifies the substance, not a universal purity specification.

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Calcium ion Lewis Structure