1 octave of a basic C major scale:



|------------------------------------------------------------------------|
|------------------------------------------------------------------------|
|------------------------------------------------------------------------|
|----------------7-9-10--------------------------------------------------|
|--------7-8-10----------------------------------------------------------|
|--8-10------------------------------------------------------------------|
    |   | | |  |  | |
    T   T S T  T  T S

Tone, Tone, Semitone, Tone, Tone, Tone, Semitone

or

Whole, Whole, Half, Whole, Whole, Whole, Half

A Tone is two frets on the fretboard. A Semitone is one fret.