UNIT 3 Periodic Table

Which element is the least reactive?

• Li

• Ne

• B

• C

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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

The atoms along the staircase are called 

• metals
• nonmetals
• metalloids
• noble gases

Which is an alkali metal?

• Magnesium
• Iron
• Sodium
• Europium

How many electrons does potassium K contain? (click to see image)

• 19
• 39
• 20
• 40

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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

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The groups of the period table tell us:

• Number of electron shells
• Number or electrons
• Number of protons
• Number of valence electrons

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The vertical (up and down) columns in the Periodic Table are called

• groups

• towers

• periods

• atomic numbers

Elements in a .................. have similar chemical properties.

• period

• group

• row

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