The dot and cross diagram shows that a water molecule is made up of one oxygen atom joined to two hydrogen atoms, so the formula of water is H 2 O. A nitrogen molecule is made up of two nitrogen ...

Covalent bonding involves the sharing of electrons between atoms. As with the ionic bond example draw a dot-and-cross diagram, taking care to show the shared electrons. There are no square ...

Gaphas is a library that provides the user interface component (widget) for drawing diagrams. Diagrams can be drawn to screen and then easily exported to a variety of formats, including SVG and PDF.