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

• groups

• towers

• periods

• atomic numbers

The Modern Periodic Table of Elements is arranged by

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

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

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

Which is an alkali metal?

• Magnesium
• Iron
• Sodium
• Europium

Which is a halogen?

• Helium
• Chlorine
• Oxygen
• Neptune

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

• period
• group
• row

Name this group: These metals are the most reactive. They have ONE valence electron.

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Name this group: These metals are the second most reactive. They have TWO valence electrons.

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Name this group: These metals contain familiar metals such as gold, iron, and copper. They have a variety of valence electrons.

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The horizontal row on the periodic table is called a

• group
• family
• period
• atomic number