What is ionization energy?

• Energy needed to destroy an atom
• Energy required to remove an electron
• Energy needed to split an electron
• Energy required to add an electron

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NGSS.HS-PS1-1

As you look down a group, ionization energy and electronegativity

• increases

• decreases

Which of the following is true for alkaline earth metals as their atomic number increases?

• The atomic radius decreases.

• Ionization energy decreases.

• The number of valence electrons increases.

• Their electronegativity increases.

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following sequences corresponds to a correct trend in ionization energy?

• Cl > S > P > Al
• Sr > Ca > Mg > Be
• Rb > K > Na > Li
• Rb > Sr > I > Xe

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

The bar graph above represents four elements and their respective ionization energies. Based on the organization of the modern periodic table, how would these elements be found on the periodic table?

• They are in the same period with W being furthest left.
• They are in the same period with W being furthest right.
• They are in the same group with W being furthest to the bottom.
• They are in a diagonal line with W being at the bottom right.

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following is true about a sulfur atom and a chlorine atom?

• Sulfur is larger and has higher ionization energy.
• Sulfur is larger and has lower ionization energy.
• Sulfur is smaller and has higher ionization energy.
• Sulfur is smaller and has lower ionization energy.

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NGSS.HS-PS1-1

Which element has the greater ionization energy?

• Magnesium (Mg)

• Phosphorus (P)

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

 Which of the following generally applies to the noble gases? 

• high ionization energy, low electronegativity, high reactivity
• high ionization energy, high electronegativity, high reactivity
• low ionization energy, low electronegativity, low reactivity
• high ionization energy, low electronegativity, low reactivity 

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NGSS.HS-PS1-1

Which element has the greater ionization energy?

• Iodine (I)

• Chlorine (Cl)

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of these elements has the highest ionization energy?

• Lithium (Li)
• Potassium (K)
• Francium (Fr)
• Sodium (Na)

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NGSS.HS-PS1-1

NGSS.HS-PS1-2