11/22 deca=10

Deca=10
decade
decagon
decane

11/21 nona =9

Nonagon
Nonagenarian
 Nonigravida

11/18 octo =8

octuple
octave
octopus

11/17 hept/seven

heptagon
heptarchy
heptameter

11/16 hex=six

hexagon
hexavalent
hexarchy

11/15 penta=five

Pentaprism
Pentagon
Pentameter 

di=two

Dialogue
Dilemma
Dioxide

11/11 tri=three

trialogue
triplications
triplets

11/9 mono=one

monotheism
monochromatic
monodynamic

11/8 ,10, 20

Neon 
 Ne
 10

calsium
  ca
20

11/7 Flourine and potassium

Flourine
symbol: F
Atomic number: 9





Potassium
symbol: K
Atomic number: 19

11/4 Oxygen

Oxygen
 symbol:  O
 atomic number : 8

Argon
   symbol: Ar
   atomic number:18

11/3 Nitrogen

Nitrogen
    N
   7





Chlorine
    Cl
    17

11/2 Carbon, Sulfur

Carbon
  C
  6

Sulfur
   S
   16

11/1 Phosphorus and Boron

Phosphorus
    P
    15









Boron
  B
  5