11/22 deca

deca=10decagon
decade
decaf

11/21 nona

nona=9
nonagon
nonactions
nonalchoholic

11/18 octo

octo=8
octogon
October
octopus

11/17 hept

hept=7
heptagon
heptad
heptachord

11/16 hex

hex=six
hexagon
hexachord
hexameter

11/15 penta

penta=five
pentagon
pentachord
pentacle

11/14 tetra

tetra= four
tetracaine
tetrameter
tetraploids

11/11 tri

tri=three
trifle
triangle
tricycle

11/10 di

di=two
digest
dice
direct

11/9 mono

mono=one
monopoly
monochromatic
monochord

11/8 Neon

Neon     Ne10

11/8 Calcium

Calcum   Ca20

11/7 Potassium

Potassium   K19

11/7 Fluorine

Fluorine  F9

11/4 Argon

Argon  Ar18

11/4 Oxygen

Oxygen O8

11/3 Chlorine

Chlorine  Cl17

11/3 Nitrogen

nitrogen N7

11/2 sulfur

sulfur  S16

11/2 Carbon

Carbon C6

11/1 Phosphorus

Phosphorus   P15

11/1 Boron

Boron  B5