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In 1869, the chemist Dmitri Mendeleev began developing the periodic table. Who knows what he arranged the elements by?
Well then why is today's modern periodic table arranged by atomic number?
By atomic mass! He also left spaces for newly discovered elements.
Well that's because in 1913, Henry Moseley created a new periodic table arranged by atomic number. It was filled with families, or groups, that contained elements with similar properties.
How do these families, or groups, work anyway?
Well for example group 1 is the alkali metals, group 2 is the alkaline earth metals, and group 18 is composed of six noble gas elements.
Well now I understand the periodic table and its elements better!
And the the rest of the table is made up of transition metals, metalloids, nonmetals, and halogens.
I would tell you all a periodic table joke but they Ar-gon!
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