Periodic Law
When elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties.
Metals
Good conductors of heat and electric current.
Nonmetals
Poor conductors of heat and electric current.
Metalloid
Generally has proportions that are similar to those of metals and nonmetals.
Alkali Metals
What the Group 1A elements are called.
Alkaline Earth Metals
What the Group 2A elements are called.
Halogens
What the nonmetals of Group 7A are called.
Noble Gases
Elements it Group 8A if the periodic table.
Representative Elements
Display of a wide range of physical and chemical properties.
Transition Metal
The highest occupied "s" sub level and a nearby "d" sub level containing electrons.
Inner Transition Metal
The highest occupied "s" sub level and a nearby "f" sub level generally containing electrons.
Atomic Radius
1/2 of the distance between the nuclei of two atoms of the same element when the atoms are joined.
Ion
An atom or a group of atoms that has a positive or negative charge.
Cation
An ion with a positive charge.
Anion
An ion with a negative charge.
Electronegativity
Ability of an atom of an element to attract electrons when the atom is in a compound.
Ionization Energy
Energy required to remove an electron from an atom.