Periodic Table

Alkali Metal

Alkali Metal

An element in group 1 of the periodic table. These elements are extremely reactive.

alkaine earth metals

An element in group 2 of the periodic table. These elements are very reactive

Anion

A negatively charged ion

Atomic Radius

The size of an atom. Sometimes called "covalent atomic radius"

Brittle

The ability to be crushed into pieces when hammered

Cation

A positively charged ion

Conductivity

The measure of the ability of an electric current to flow through a substance

Ductile

The ability to be stretched into a wire

Dull

The lack of ability to reflect light efficiently

Electronegativity

A measure of the attraction of a nucleus for a bonded electron

Family

The vertical column on the periodic table that has a specific name

Group

Columns down the periodic table that denote elements with the same number of valence electrons and similar chemical prop.

Halogen

An element in Group 17 of the periodic table. These elements are extremely reactive

Ionic Radius

The size of an ion compared to the original atom. Metal atoms lose electrons and form + charged ions that are smaller than the original atom

Ionization Energy

The energy required to remove an electron from an atom

Luster

The ability to reflect light

Malleable

The ability to be hammered or rolled into thin sheets

Mendeleev

Published the first periodic table

Metal

Elements that have low electronegativity and ionization energy and large radius that tend to lose electrons to form chemical bonds.

Metalloid (semi-metals)

an element that has both metallic and nonmetallic properties

Noble Gas

An element in group 18 of the periodic table

Nonmetal

Elements that have high electronegativity and ionization energy and small radius that tend to gain or share electrons to form chemical bonds.

Period

Rows across the periodic table that denote elements with the same number of principal energy level

Periodic Law

The properties of elements are periodic functions of their atomic numbers

Periodic Table

The arrangement of elements placed near each other based on their similar properties

Symbol

The one-

Transition metal

An element in Groups 2-12 of the periodic table. Many of these elements have colored ions