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