Review Chemistry: The Periodic Table

How did Mendeleev organize the elements in his periodic table?

• increasing mass only
• increasing atomic number only
• increasing atomic mass with periods and groups
• increasing atomic number with periods and groups

Why did Mendeleev leave blanks in his periodic table?

• forgot elements
• left room for elements not yet discovered
• placed elements in wrong positions leaving gaps

The Modern Periodic Table of Elements is arranged by

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

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The fact that all elements in group 17 are highly reactive is an example of the periodic table's...

• Periodicity

• Property

• Relativity

• Trend

What group has a total of 5 valence electrons

• Group 1

• Group 5

• Group 15

• Group 13

Main group elements include which block's on the periodic table?

• s and p

• s and d

• p and d

• d and f

This group does NOT react with anything ever, they are already happy.

• Metals

• Transition Metals

• Noble Gases

• Halogens

This group is made of the MOST reactive metals.

• Transition metals

• Metalloids

• Alkali Metals

• Alkaline Earth Metals

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Which group has the most reactive nonmetals?

• alkali metals
• noble gases
• metalloids
• halogens

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Sodium (Na) and potassium (K) are in the same group on the periodic table. Based on their locations, which statement about sodium and potassium is true?

• Sodium is less electronegative than potassium. 
• Sodium has fewer energy levels than potassium. 
• Sodium has a larger ionic radius than potassium. 
• Sodium has lower ionization energy than potassium. 

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