Ionization Energy (8.2.2)

Question 1

What is Ionization Energy (IE)?

Answer 1

• Ionization energy (IE) is the energy necessary to remove an electron from an atom, molecule or ion.

Question 2

Why does ionization energy decrease when moving down a group?

Answer 2

• Moving down a group, ionization energy decreases because of increased electron shielding.

Question 3

Why does moving from left to right increase effective nuclear charge?

Answer 3

• Moving across a row from left to right ionization energy increases because of increased effective nuclear charge.