Definitions for Chem Test Unit 4

Actinide Series

All elements in this series are radioactive

Non-metals

Poor conductors of heat and electricity; solids are dull and brittle

Representative elements

Made up of groups 1,2 and 13-18

Groups

Vertical columns on the periodic table; all elements have similar chemical and physical properties; all elements have the same number of valence electrons

Inner transition metals

Made up of the Lanthanide series and the Actinide series

Noble gasses

Do not naturally combine with other elements

Metals

Are ductile, malleable and lustrous

Alkaline earth metals

All elements of this group have 2 valence electrons

Transition metals

Made up of groups 3-12

Halogens

Elements in this group will easily bond with an alkali metal to form a salt

Lanthanide series

The “rare earth elements”

Periods

Horizontal rows, atomic number increases as you move across the row

Alkali metals

All elements in this group have 1 valence electron

Metalloids

Have the properties of both metals and non-metals

How many groups are on the periodic table

18

How many periods are in the periodic table

7

Groups 3-12 are called the…

Transition metals