06. Periodic Table

Which two families on the periodic table are considered the most reactive?

• Noble Gases and Alkali Metals

• Alkali Metals and Halogens

• Noble Gases and Halogens

• Alkali Metals and Alkaline Earth Metals

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Each column in the periodic table is called a 

• period
• group
• cluster
• unit

Elements to the left of the stairstep line are:

• metals

• nonmetals

• metalloids

Which element pairs have the most similar chemical properties?

• K and Na

• K and Ca

• K and Cl

• Na and S

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Which group of the periodic table is composed of inert (unreactive) gases?

• Alkali Metals

• Alkaline Earth Metals

• Halogens

• Noble Gases

Which number is the atomic mass?

• 79

• 196.97 amu

• 197 amu

• 118

Pure forms of these elements are stored in oil so they won't react with oxygen and water in the air.

• Alkali Metals
• Alkaline-earth metals
• Halogens
• Noble Gases

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How did Mendeleev arrange the elements?

• alphabetical 
• density
• melting point
• atomic mass

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How many valence electrons create a stable atom?

• 1

• 2

• 8

• 18

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Cations are

• positive

• negative