Periodic Trends in Ionization Energy

What is ionization energy?

• The energy required to add an electron to an atom

• The energy required to remove an electron from an atom

• The energy required to split an atom

• The energy required to combine two atoms

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What happens to an atom when it loses an electron?

• It becomes a positively charged ion

• It becomes a neutral atom

• It remains unchanged

• It becomes a negatively charged ion

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Why does ionization energy increase across a period?

• Because the number of protons increases

• Because the number of protons decreases

• Because the number of neutrons increases

• Because the number of energy levels increases

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Which element has a higher ionization energy: silicon (atomic number 14) or chlorine (atomic number 17)?

• Both have the same ionization energy

• Chlorine

• Silicon

• Cannot be determined

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Why does chlorine have a higher ionization energy than silicon?

• Because chlorine has fewer protons

• Because silicon has more valence electrons

• Because chlorine has more protons

• Because silicon has more energy levels

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What is the main reason for the decrease in ionization energy down a group?

• Increase in electron shielding

• Decrease in the number of protons

• Increase in the number of protons

• Decrease in electron shielding

Which element has a lower ionization energy: magnesium (atomic number 12) or strontium (atomic number 38)?

• Cannot be determined

• Both have the same ionization energy

• Strontium

• Magnesium

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Why does strontium have a lower ionization energy than magnesium?

• Because magnesium has more protons

• Because magnesium has more energy levels

• Because strontium has more energy levels

• Because strontium has fewer protons

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Which element has a higher ionization energy: oxygen (atomic number 8) or selenium (atomic number 34)?

• Oxygen

• Selenium

• Both have the same ionization energy

• Cannot be determined

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Why does oxygen have a higher ionization energy than selenium?

• Because oxygen has less electron shielding

• Because selenium has fewer protons

• Because selenium has more valence electrons

• Because oxygen has more energy levels

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