Ionization Energy Trends

What does the first ionization energy refer to?

• Energy needed to remove one mole of electrons from one mole of gaseous atoms

• Energy to remove one mole of electrons from a solid atom

• Energy to convert one mole of gaseous atoms into solid ions

• Energy required to add one mole of electrons to gaseous atoms

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What is the significance of ionization energy being positive?

• It means electrons are added

• It indicates a chemical reaction

• It signifies energy absorption

• It indicates an exothermic process

Which group of elements has the highest ionization energies?

• Group 2: Alkaline Earth Metals

• Group 18: Noble Gases

• Group 17: Halogens

• Group 1: Alkali Metals

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Which element is expected to have the lowest ionization energy?

• Potassium

• Argon

• Neon

• Helium

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What is the trend of ionization energy down a group?

• Varies depending on the period

• Decreases

• Increases

• Stays the same

How does ionization energy change across a period?

• It increases

• It remains constant

• It fluctuates unpredictably

• It decreases

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NGSS.HS-PS1-1

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Which pair shows a decrease in ionization energy?

• Both B and C

• Lithium to Sodium

• Beryllium to Boron

• Nitrogen to Oxygen

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Which of the following is an exception to the general trend in ionization energy?

• The drop from beryllium to boron

• The increase from helium to neon

• The decrease from lithium to sodium

• The increase from sodium to magnesium

What causes ionization energy to increase across a period?

• Decrease in electron shielding

• Decrease in nuclear charge

• Increase in atomic radius

• Increase in nuclear charge and decrease in atomic radius

Why does ionization energy decrease down a group?

• Owing to decreased nuclear charge

• Because of increased atomic radius and electron shielding

• Due to increased nuclear charge

• Due to decreased atomic radius

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