11- 22 deca

Deca= 10
Decagram
Decameter
Decagon

11- 21 nona

Nona= 9
Nonagon
Nonagram
Nonaprism

11-18 octo

Octo= 8
Octogon
Octogram
Octoprism

11-17 hept

Hept= 7
Heptagon
Heptameter
Heptahydrate

11-16 hex

Hex= six
Hexagon
Hexagonal
Hexagram

11-10 di

Di= two

Dioxide

Dialogue

Dilemma

11-11 tri

Tri= three

Triangle

Tricycle

Triacid

11-15 five

Penta= five
Pentagon
Pentameter
Pentaprism

11-14 tetra

Tetra= four
Tetrapods
Tetrahedral
Tetrapetalous

11-9 Mono

mono= one
Monotreme
MonoDrama
Monofractal

My leg muscle torn so bad that eventually my leg bones became monofractal.

11-8 10, 20

Neon
10
Ne

Calcium
20
Ca

fluorine, potassium

Fluorine
F
9

Potassium
K
19

11-4 Oxygen, Ar

Oxygen
O
8


Argon
Ar
18

11-3 nitrogen, 17

Nitrogen
N
7

Chlorine
Cl
17

11-2 Carbon, S

Carbon
C
6


Sulfur
S
16

11-1 5, P

Boron
B
5

Phosphorus
P
15