nona=9
nonagon
nonags
nonahydrate

octo=8
octogon
october
octogenarian

hept=seven
heptagon
heptane
heptanol

hex=six
hexogon
hexane
hexadecimal

tetra=four
tetrahedron
tetracyline
tetragrammaton

tri=three
tricycle
triangle
trimester






11:11:11(; (:

mono=one
monopoly
monoprice

neon
Ne
10

calcium
Ca
20

fluorine
F
9


potassium
K
19

oxygen
O
8


Argon
AR
18

Nitrogen
N
7


chlorine
CI
17

Carbon
C
5


sulfer
S
16

5
boron
B


P
phosphorus
15