THE PERIODIC TABLE Silvia Sanguinetti Period Eight
Mendeleev Mendeleev created the Period Table Mendeleev’s version was published in 1869 in Russia. He put the elements in order by their atomic mass and similar properties.
PeriodsThe elements are organized horizontally on thePeriodic table in rows called periods.The elements are placed in each period by how manyelectron orbitals they have.There are eighteen periods.
GroupsThe elements are organized vertically on the Periodictable in columns called groups.The elements are placed in each group by how manyvalence electrons they have.There are eight periods.
Atomic MassThe elements on the periodic table are arranged inorder by atomic mass.The element with lowest atomic mass is Helium andthe element with the highest atomic mass isUnunoctium.
Metals ElementMost of the elements on the Atomic Number SymbolPeriodic Table are metals.The diﬀerent kinds of metals are DensityAlkali Metals, Alkali Earth Melting PointMetals, Lanthanoids, Actinoids, Atomic MassTransition Metals, and Post-Transition Metals. Gold is a Transition MetalMetals are on the left side of thePeriod Table.
Metalloids Element Atomic Number SymbolThere are seven elements onthe Periodic Table that aremetalloids. Atomic Mass DensityMetalloids are on the rightside of the Period Tablebetween the Metals and theNon-Metals. Melting Point Boiling Point
Nonmetals Element Atomic Number SymbolThe rest of the elements on thePeriodic Table are Nonmetals. Atomic Mass DensityThe diﬀerent kinds ofNonmetals are Halogens, NobleGases and Other Nonmetals. Melting Point Boiling PointAll of the Nonmetals are on the Helium is a Noble Gas.right side of the Periodic Tableexcept Hydrogen.