IONIZATION ENERGY PRACTICE Which has a higher first

IONIZATION ENERGY PRACTICE

Which has a higher first IE? Argon (Ar) or Krypton (Kr)? WHY?

Which has a higher first IE? Argon (Ar) Fewer energy levels – valence electrons are closer to the nucleus – more attracted – harder to remove

Which has a lower first IE? Calcium (Ca) or Galium (Ga)? WHY?

Which has a lower first IE? Galium (Ga) EXCEPTION First p electron is shielded (cannot penetrate nuclear region) – is less attracted to the nucleus, so is easier to remove

Which has the lowest first ionization energy? Arsenic Selenium Silicon Iodine

Which has the lowest first ionization energy? Iodine Most energy levels – valence electrons are greatest distance from the nucleus – least attracted, so easiest to remove

Which has a lower first IE Arsenic (As) or Selenium (Se)? WHY?

Which has a lower first IE Selenium (Se) EXCEPTION Repulsion caused by pairing of electrons makes 4 th p electron easier to remove

Which has the highest first ionization energy? Magnesium Aluminum Sulfur Argon

Which has the highest first ionization energy? Argon All the same energy level, so look at Zeff – greatest core charge so valence electrons are most attracted to this nucleus – hardest to remove

Which has a lower first IE? Sodium (Na) or Magnesium (Mg)? WHY?

Which has a lower first IE? Sodium (Na) Same energy level, so look at Zeff – weaker core charge, so valence electrons are less attracted to the nucleus – easier to remove