The Water molecule in 3-D

The Water molecule - rotatable in 3 dimensions

This shows a single molecule of water. We all know that water has the formula H2O.

Each hydrogen shares an electron with oxygen and this forms a pair of covalent bonds, but the hydrogen atoms are not attached to oxygen in a straight line.
Click to see/ hide more detail about electrons in water

The atomic arrangement means that the water molecule has a partial negative charge (δ-) near the oxygen atom due the unshared pairs of electrons, and partial positive charges (δ+) near the hydrogen atoms. This allows water to form hydrogen bonds (with itself, and other compounds with electronegative atoms) and also explains the special physical and chemical properties of water which are often seen as essential to life.

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Other related topics on this site

(also accessible from the drop-down menu above)
The Biological Significance of Water

Interactive 3-D molecular graphic models on this site

(also accessible from the drop-down menu above)
Hydrogen bonds in water
The structure of ice
Liquid water animation