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Molecular compounds contain nonmetals, which are on the far right of the periodic table.
Everything on the periodic table is an element and not a compound at all.
The modern long form version of the periodic table is now accepted by the IUPAC.
"hcn" does not occur in a proper periodic table. "HCN" is the molecular formula for a covalent compound named "hydrogen cyanide".
periodic table
Mendeleev's version of the Periodic Table was organized by increasing mass. The modern periodic table is now organized by atomic number.
mendaleev
Mendeleev
Dmitri Mendeleev made the periodic table. He is credited as being the creator of the first version of the periodic table of elements. Using the table, he predicted the properties of elements yet to be discovered.
The modern version of the periodic table is arranged according to the atomic number.
The 1897 version
Yes depending on which scientists version of the periodic table you look at. Henry Moseleys ideas on the periodic table was the first to increase by atomic number.