Periodic Table - Part II

Indicates the number of valence electrons that an atom has. 

Elements in groups 3 - 12 are called

First group in the periodic table

How many protons are in an atom of Silicon?

Elements 1 - 93

How many periods does the Periodic Table have?

Indicates the number of energy levels that an atom has.

Metals are good conductors of electricity and heat. 

How many neutrons are in Aluminum?

Group 17 is also called

The periodic table is arranged in ABC order. 

Halogens are elements with properties that fall between those of metals and nonmetals. 

How many groups are in the periodic table?

Second group of the periodic table.

Elements at the bottom were pulled out to keep the table from being too long; the first row

Most elements are___.

The zigzag line between groups 13-16 separates what?

Elements of the same group have similar properties because they have the same number of protons

Group 18 is unreactive and called the 

Elements that touch or border the zigzag line are classified as ___.