tabno -tab- gismu

x1 is a quantity of/contains/is made of carbon/graphite/[diamond]/charcoal; x1 is organic.

See also kolme.

In notes:

kolme
x1 is a quantity of/contains/is made of coal/peat/anthracite/bitumen from source x2.
tabdjalitki
x1 is a carbonated beverage consisting of x2
tabrelkijno
x1 is a quantity of carbon dioxide (CO₂)
tabykrili
k1 is crystalline carbon (default diamond) in form/arrangement k3
tabypavykijno
x1 is a quantity of carbon monoxide (CO)
tabypinsi
p1 is a pencil.
rakle
x1 is an atomic element in group x2 [usually, vertical column; denotes electron configuration and, thereby, chemical similarity with vertical neighbors] and period x3 [usually, horizontal row; denotes similarity in size with horizontal neighbors, as well as having the same number and type of electron shells as them] and belonging to other 'class'/'category'/'type'/having other properties x4 according to scheme/organization pattern/standard/periodic table x5.
ratniklesi
x1 is an atomic element in group x2 [usually, vertical column; denotes electron configuration and, thereby, chemical similarity with vertical neighbors] and period x3 [usually, horizontal row; denotes similarity in size with horizontal neighbors, as well as having the same number and type of electron shells as them] and belonging to other 'class'/'category'/'type'/having other properties x4 according to scheme/organization pattern/standard/periodic table x5.