Periodic Table History
This Russian chemist is credited with developing the first periodic table.
Dimitri Mendeleev
These are the vertical columns on the periodic table.
Groups or Families
This is the only metal that is liquid at room temperature.
Mercury
This scientist proposed the Law of Octaves, noticing patterns in element properties every eighth element.
John Newlands
These are the horizontal rows on the periodic table.
Periods or series
This is the only nonmetal that is a liquid at room temperature.
Bromine
Henry Moseley reorganized the periodic table based on this property of atoms.
Atomic Number
These elements are located in the right-center of the periodic table and possess properties of both metals and nonmetals.
Metalloids
Most elements are found in this state at room temperature.
Solid
This individual’s early attempt at organizing elements consisted of grouping them into triads based on similar properties.
Johann Dobereiner
This is the region of the periodic table containing elements with partially filled d orbitals.
Transition metals
These elements are often found in this state at room temperature due to weak intermolecular forces.
Gas
The German scientist who organized the elements similar to Mendeleev, but was NOT given the name “Father of the Periodic Table”
Lothar Meyer
This is the region of the periodic table containing elements with partially filled f orbitals, often placed below the main body of the table.
Inner transition elements, lanthanide & actinide series, f-block
A synthetic element with an atomic number less than 92.
Technetium or Promethium