1859 1869 1954
Dmitry Mendeleev Dmitry Mendeleev and Lothar Meyer Albert Einstein
not so important important very important
Helium Gold Hydrogen
the Greek name of gold the Hebrew name of gold the Latin name of gold
rows periods lines
groups periodicals elements
milligram megahertz magnesium
atomic weight number of atomic shells color
neutrons molecules electrons in their outer shell
it describes the periodic motion of celestial bodies. it describes the periodic arrangement of chemical elements. it describes the signs of the zodiac in a new way.
plutonium Pluto pollution.
the number of electrons in an atom. the number of protons in the nucleus of an atom the number of shells belonging to an atom
in the far left column of the periodic table in the far right column of the periodic table in the middle of the periodic table
uranium plutonium both have the same atomic number
Carbon the C programming language the speed of light
