Deca=10
Decagon
Decade
Decagram
Nona=9
Nonagon
Nonagram
Nonagenerian
Octo=8
Octogan
Octopus
October
Hept= Seven
Heptagon
Hepthalon
Heptane
hex=six
hexagon
cachexia
cachexic
Penta=Five
Pentagon
Pentagram
Pentateuch
Tetra=Four
Tetracycline
Tetragon
Tetrapod
mono=one
Monad
Monandry
Monogyny
Neon-Ne-10
Calcium-Ca-20

Fluorine-F-9
Potassium-K-19

Oxygen-O-8
Argon-Ar-18

Nitrogen-N-7
Chlorine-Cl-17

Carbon-C-6
Sulfur-S-16

Boron-B-5
Phosphorous-P-15
