Periodic Review

Which elements have the most similar chemical properties?

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

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Which element in period 3 has the greatest tendency to gain electrons?

• Ar
• Cl
• Si
• Ca

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Which of the following elements has the highest ionization energy?

• sodium
• aluminum
• calcium
• phosphorus

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The first Periodic Table was arranged by 

• atomic mass
• atomic number
• number of electrons
  mass number
• oxidation number

An atom that has 20 protons, 20 neutrons, and 20 electrons is classified as

• an alkali metal
• a noble gas
• an alkaline earth metal
• a halogen

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NGSS.HS-PS1-1

A diatomic element with a high ionization energy would most likely be a 

• nonmetal with high electronegativity
• metal with high electronegativity
• nonmetal with low electronegativity
• metal with low electronegativity

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As you move down Group 16, the electronegativity of the elements

• increases
• decreases
• remains the same

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Compared to the atomic radius of a sodium atom, the atomic radius of a magnesium atom is smaller. The smaller radius is primarily a result of the magnesium atom having 

• smaller nuclear charge
• fewer principal energy levels
• greater nuclear charge
• more principal energy levels

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Which element is considered a malleable substance? 

• sulfur
• radon
• hydrogen
• gold

As we consider the elements of Period 2 from left to right, there is a general decrease in 

• ionization energy
• nonmetallic character
• metallic character
• electronegativity

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