Molecule Gallery
Loading simulation…
flagWhat you'll discover
- arrow_forwardRecognise common molecules by their 3D shapes: bent, linear, tetrahedral, pyramidal
- arrow_forwardRead ball-and-stick models and standard CPK element colours
- arrow_forwardConnect bond angles like water's 104.5° to the molecule's properties
- arrow_forwardExplain why molecular shape matters for smell, taste and life itself
Molecules have shape
A chemical formula like H₂O tells you the ingredients, but molecules are three-dimensional objects with definite geometry. Water is not a straight line: its two hydrogen atoms sit at an angle of 104.5°, making the molecule bent. Carbon dioxide really is linear, methane is a perfect tetrahedron with 109.5° angles, and ammonia is a low pyramid.
These shapes arise because pairs of electrons around the central atom repel each other and spread as far apart as possible — a rule known as VSEPR. Water is bent precisely because two invisible lone pairs on the oxygen squeeze the hydrogens together.
Reading the model
Chemists colour atoms by a convention called CPK colouring, used in this gallery: hydrogen is white, carbon dark grey, oxygen red, nitrogen blue, chlorine green and sodium purple. The sticks between balls are covalent bonds — shared pairs of electrons. A double line of sticks, as in O₂ or CO₂, is a double bond: two shared pairs, shorter and stronger than a single bond.
Not everything bonds this way. The salt fragment in the gallery is an ionic lattice: Na⁺ and Cl⁻ ions held by electrostatic attraction in an endlessly repeating grid, which is why salt forms cubic crystals.
Why shape matters
Water's bent shape makes one side of the molecule slightly negative and the other slightly positive — it is polar. That tiny asymmetry is why water dissolves salt and sugar, why ice floats, and why water can climb up plant stems. Straighten the molecule and none of that would work; life as we know it depends on 104.5°.
Shape rules biology everywhere: enzymes recognise molecules the way a lock recognises a key, your nose tells smells apart largely by molecular shape, and a drug works only if it fits its target protein. Glucose's ring shape is exactly what your cells' transporters are built to grab.