"Natural" Chord.

 By natural, its positioning on the keyboard is unique, oh right then... easy positioning, without touching black tuts.

 Of course we already knew three notes "natural" chord

 Starting with C chord, a major one, with C-E-G notes, we could shift our fingers positioning to the right (the white keys, we  won't touch the black here) and we have Dm and then Em, F, G, Am, Bdim.

 Now, add one more note so we have C-E-G-B, yup, thats Cmaj7.

 Shift to the right we'll have Dm7, Em7, Fmaj7, G7, Am7 and Bdim7

 What about adding fifth note? No problem, we have C-E-G-B-D, the Cmaj9 chord

 Again, shift to the right to get Dm9, Em7b9, Fmaj9, G9, Am9, Bdim7b9