Ionic vs Covalent Bonds
Change electronegativity difference and watch bonds go from covalent to polar to ionic.
About the Ionic vs Covalent Bonds
Free bond type simulation. Pick two atoms, see the electronegativity difference, and watch electrons shared equally, unequally, or transferred to make an ionic bond. Built for molecules, the ionic vs covalent bonds runs instantly in your browser: change a setting or drag an object and the result updates at once, so you learn by trying things out rather than only reading about them.
Change electronegativity difference and watch bonds go from covalent to polar to ionic. Use it to explore molecules ideas at your own pace, then check what you found against the key ideas further down this page.
How to use the Ionic vs Covalent Bonds
- Use the controls to change Atom 1, Atom 2, Your atom X: electronegativity, Your atom Y: electronegativity. The simulation reacts instantly.
- Pick an option such as NaCl, MgO, CaF₂, KBr to switch modes or load an example.
- Where you see a glowing handle, object, weight or atom, drag it with your mouse or finger. Everything responds in real time.
- Watch the readouts and graphs update as you experiment, and compare what you see with the key ideas below.
Things to try
- Compare NaCl and H₂.
- Try C–H and O–H.
- Find the transition to ionic.
- Read the ionic character.
Key ideas you can learn
- Covalent bonds share electrons; ionic bonds transfer them.
- A small electronegativity difference gives nonpolar covalent, a medium one gives polar covalent, and a large one gives ionic.
- Ionic compounds form crystal lattices, not separate molecules.
Ionic vs covalent: why the classification matters
The kind of bond a compound has shapes almost everything about how it behaves — whether it melts on a stove or needs a furnace, whether it conducts electricity, and what it dissolves in. This is the same classification the simulation above calculates from electronegativity difference.
| Property | Ionic compounds | Covalent compounds |
|---|---|---|
| Melting / boiling point | High (often 300–2800°C) — breaking the lattice takes a lot of energy | Usually low; many are gases or liquids at room temperature (network solids like diamond or quartz are exceptions) |
| Conducts electricity as a solid? | No — ions are locked in place in the lattice | No — there are no free charged particles |
| Conducts electricity molten or dissolved? | Yes — ions become free to move and carry charge | Usually no; a few polar covalent compounds (like HCl) ionize in water and then conduct |
| Solubility | Often dissolves well in water and other polar solvents | Nonpolar compounds dissolve in nonpolar solvents; polar covalent compounds (sugar, ethanol) can also dissolve in water |
| Typical state at room temperature | Solid, crystalline | Gas, liquid, or a soft/low-melting solid |
| Hardness & brittleness | Hard but brittle — a sharp blow shifts a layer of ions so like charges line up and repel, shattering the crystal | Varies a lot — from soft waxy solids to extremely hard network solids like diamond |
Where this is used in the real world
Bond type decides whether a material is a salt, a metal-like conductor, a gas or a solid, so it affects melting points, solubility and conductivity.
Who is this simulation for?
Chemistry and biology students learning bonding and molecular shape, and teachers who need an interactive 3D model instead of a textbook drawing.
For teachers: project it on the board, let students predict what will happen, then run it together. For students: change one thing at a time and write down what changes.
Frequently asked questions
How do I tell if a bond is ionic or covalent?
Look at the electronegativity difference: below about 0.4 is nonpolar covalent, 0.4 to 1.7 is polar covalent, and above about 1.7 is ionic.
Why do ionic compounds conduct electricity when dissolved?
Their ions are free to move in solution and carry charge.
Is the Ionic vs Covalent Bonds free to use?
Yes. It is completely free, with no signup, no download and no ads inside the simulation. It runs in your web browser.
Does the Ionic vs Covalent Bonds work on a phone or tablet?
Yes. It uses touch as well as the mouse, so you can drag objects with your finger. A larger screen makes the controls easier to see.