Periodic Table

Dmitri Mendeleev (or Mendeleyev)
Russian chemist and teacher who published his first version of the periodic table in 1869.
Lothar Meyer
German chemist who published a periodic table in 1869.
J.W. Dobereiner
German chemist who, in 1929, published a classification system that grouped elements into triads.
Henry Mosely
British physicist who developed a method to determine the charge, and therefore the atomic number, of each element.
Alkali Metals
Any metal in group 1A of the periodic table. These elements are characterized by high reactivity and are not found uncombined in nature.
Alkaline Earth Metals
Any element in group 2A of the periodic table. These elements are characterized by relatively high reactivity and are not found uncombined in nature.
Atomic Radius
One-half of the distance between the nuclei of two atoms of the same element that are bonded together.
Electronegativity
The ability of an atom to attract electrons when the atom is in a compound.
Halogens
Any of the nonmetals in group 7A (or 17) of the periodic table. This group is the most reactive group of nonmetals.
Inner Transition Metal
An element in the Lanthanide or Actinide series, located at the bottom of most periodic tables.
Ionization Energy
The energy required to remove and electron from an atom in its gaseous state.
Metalloids
Elements that tend to have properties that are similar to those of metals and nonmetals. These elements are found along the “stair steps” on the periodic table.
Metals
Class of elements that are good conductors of heat and electricity. They tend to be ductile, malleable, and shiny.
Noble Gases
Elements in Group 8A (or 18) of the periodic table. The outer shell of electrons is full in each of these elements.
Nonmetals
Elements that tend to be poor conductors of heat and electric current. They also tend to be brittle and dull.
Periodic Law
When the elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties.
Representative Elements (or Main Group Elements)
An element in an “A” group on the periodic table. These elements belong to the s-block and p-block on the periodic table.
Transition Metal
The group “B” elements, also known as the d-block elements.
Ductility
The property of being able to be drawn into a wire.
Malleability
The property of being able to be beaten into thin sheets.
Conductivity
The property of being able to easily transfer heat and electricity through a substance.
s-block elements
Elements of groups 1A and 2A
p-block elements
Elements of groups 3A through 8A on the periodic table.
d-block elements
Elements of groups 3B through 12B on the periodic table. These elements are also know as the transition elements.
f-block elements
Inner Transition Elements. Also known as the lanthanide series and the actinide series.
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