Periodic Table

_______ are the ROWS on the periodic table.

• Families
• Groups
• Periods
• Elements

In the modern periodic table elements are arranged by:

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Each column in the periodic table is called a 

• period
• group
• cluster
• unit

Which elements have the most similar chemical properties?

• K and Na
• K and Ca
• K and Cl
• K and S

Which group of the periodic table is composed of inert (not reactive)  gases?

• alkali metals
• alkaline earth metals
• halogens
• noble gases

Elements which are shiny, conduct electricity and heat are called

• metal
• nonmetal
• metalloid
• nonexistent

This class of elements are sometimes called "semiconductors."

• Metals
• Nonmetals
• Metalloids
• Groups

The atomic number tells you what?

• number of electrons only
• number of protons only
• number of neutrons
• both electrons and protons in an atom.

What does the 1.00794 stand for?

• Hydrogen
• atomic number
• atomic mass
• atomic explosion

What's a valence electron?

• electrons in the second energy level
• electrons in the outermost energy level
• the atomic number
• electrons in the first level