Ionization Energy Trend on the Periodic Table

What is ionization energy?

• The energy required to remove an electron from an atom

• The energy required to add an electron to an atom

• The energy required to split an atom

• The energy required to form a chemical bond

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NGSS.HS-PS1-1

How does ionization energy change as you move from left to right across a period?

• It generally increases

• It generally decreases

• It remains the same

• It fluctuates randomly

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Why does ionization energy decrease as you move down a group?

• Electrons are farther from the nucleus

• The number of protons decreases

• The positive charge of the nucleus decreases

• Electron-electron repulsion increases

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which group has a lower ionization energy than Group 2?

• Group 13

• Group 15

• Group 16

• Group 1

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Why is the second ionization energy always higher than the first?

• Removing the first electron reduces electron-electron repulsion

• The nucleus gains more protons

• The atom becomes more stable

• The atomic radius increases